• Abelia 
• Abelia aitchinsonii
• Abelia biflora - (China)
• Abelia buddleioides - (China)
• Abelia chinensis - (China)
• Abelia coriacea - (Mexico)
• Abelia corymbosa - (Central Asia)
• Abelia curviflora - (Japan)
• Abelia dielsii - (China)
• Abelia engleriana - (Sichuan, China)
• Abelia fargesii - (Japan)
• Abelia floribunda - Mexican Abelia (Mexico)
• Abelia forrestii - (China)
• Abelia integrifolia - (Japan)
• Abelia ionostachya - (Japan)
• Abelia macrotera - (China)
• Abelia mexicana - (Mexico)
• Abelia mosanensis - (Korea)
• Abelia occidentalis - (Mexico)
• Abelia parvifolia - (China)
• Abelia serrata - (Japan)
• Abelia spathulata - (Japan)
• Abelia speciosa - (Mexico)
• Abelia tomentosa - (Japan)
• Abelia taihyonii - (Korea)
• Abelia triflora - (Himalaya)
• Abelia umbellata - (Sichuan, China)
• Abelia uniflora - (China)
•  

• Abeliophyllum (White Forsythia)
•  
• Abelmoschus (Okra)
• Abelmoschus caillei - (syn. Hibsicus manihot var. caillei)
• Abelmoschus esculentus - (syn. Hibiscus esculentus)
• Abelmoschus manihot - (syn. Hibiscus manihot)
• Abelmoschus moschatus - (syn. Hibiscus abelmoschus)
• Abelmoschus ficulneus - (syn. Hibiscus ficulneus)

•  
• Abies (Fir)
• Section Balsamea
  • Abies fraseri—Fraser Fir
  • Abies balsamea—Balsam Fir
    • Abies balsamea var. phanerolepis—Bracted Balsam Fir
  • Abies lasiocarpa—Subalpine Fir
    • Abies lasiocarpa var. arizonica—Corkbark Fir
    • Abies lasiocarpa var. bifolia—Rocky Mountains Subalpine Fir
  • Abies sibirica—Siberian Fir
    • Abies sibirica var. semenovii—
  • Abies sachalinensis—Sakhalin Fir
  • Abies koreana—Korean Fir
  • Abies nephrolepis—Khinghan Fir
  • Abies veitchii—Veitch's Fir
    • Abies veitchii var. sikokiana—Shikoku Fir

• Section Grandis
  • Abies grandis—Grand Fir or Giant Fir
    • Abies grandis var. idahoensis—Interior Grand Fir or Giant Fir
  • Abies concolor—White Fir
    • Abies concolor subsp. lowiana—Low's White Fir
  • Abies durangensis—Durango Fir
    • Abies durangensis var. coahuilensis—Coahuila Fir
  • Abies flinckii—Jalisco Fir
  • Abies guatemalensis—Guatemalan Fir

• Section Abies
  • Abies nebrodensis—Sicilian Fir
  • Abies alba—Silver Fir
  • Abies borisii-regis—Bulgarian Fir
  • Abies cephalonica—Greek Fir
  • Abies nordmanniana—Nordmann Fir or Caucasian Fir
    • Abies nordmanniana subsp. equi-trojani—Kazdağı Fir, Turkish Fir
    • Abies nordmanniana subsp. bornmülleriana—Uludağ Fir
  • Abies pinsapo—Spanish Fir
    • Abies pinsapo var. marocana—Moroccan Fir
  • Abies numidica—Algerian Fir
  • Abies cilicica—Syrian Fir

• Section Momi
  • Abies kawakamii—Taiwan Fir
  • Abies homolepis—Nikko Fir
  • Abies recurvata—Min Fir
    • Abies recurvata var. ernestii—Min Fir
  • Abies firma—Momi Fir
  • Abies beshanzuensis—Baishanzu Fir
  • Abies holophylla—Manchurian Fir
  • Abies chensiensis—Shensi Fir
    • Abies chensiensis subsp. salouenensis—Salween Fir
  • Abies pindrow—Pindrow Fir
  • Abies ziyuanensis—Ziyuan Fir

• Section Amabilis
  • Abies amabilis—Pacific Silver Fir
  • Abies mariesii—Maries' Fir

• Section Pseudopicea
  • Abies delavayi—Delavay's Fir
    • Abies delavayi var. nukiangensis—
    • Abies delavayi var. motuoensis—
    • Abies delavayi subsp. fansipanensis—
  • Abies fabri—Faber's Fir
    • Abies fabri subsp. minensis—
  • Abies forrestii—Forrest's Fir
  • Abies chengii—Cheng's Fir
  • Abies densa—Bhutan Fir
  • Abies spectabilis—East Himalayan Fir
  • Abies fargesii—
  • Abies fanjingshanensis—Fanjingshan Fir
  • Abies yuanbaoshanensis—Yuanbaoshan Fir
  • Abies squamata—Flaky Fir
  • Abies webbiana-Talispatra

• Section Oiamel
  • Abies religiosa—Sacred Fir
  • Abies hickelii—Hickel's Fir
    • Abies hickelii var. oaxacana—Oaxaca Fir

• Section Nobilis
  • Abies procera—Noble Fir
  • Abies magnifica—Red Fir
    • Abies magnifica var. shastensis—Shasta Red Fir

• Section Bracteata
  • Abies bracteata—Bristlecone Fir

• Section Incertae sedis
  • Abies milleri

•  
• Abroma
• Abroma augusta
• Abroma fastuosa

• Abromeitiella (Obsolete)
• Deuterocohnia bracteosa
• Deuterocohnia brevifolia
• Deuterocohnia brevispicata
• Deuterocohnia chrysantha
• Deuterocohnia digitata
• Deuterocohnia gableana
• Deuterocohnia glandulosa
• Deuterocohnia haumanii
• Deuterocohnia longipetala
• Deuterocohnia lorentziana
• Deuterocohnia lotteae
• Deuterocohnia meziana
  • var. carmineoviridiflora
• Deuterocohnia pedicellata
• Deuterocohnia recurvipetala
• Deuterocohnia scapigera
  • ssp. sanctae-crucis
• Deuterocohnia schreiteri
• Deuterocohnia seramisiana
• Deuterocohnia strobilifera
  • var. inermis

•  
• Abronia (Sand Verbena)
• Abronia alpina
• Abronia ameliae
• Abronia ammophila
• Abronia angustifolia
• Abronia argillosa
• Abronia bigelovii
• Abronia bolackii
• Abronia carletonii
• Abronia cycloptera
• Abronia elliptica
• Abronia fragrans
• Abronia latifolia
• Abronia macrocarpa
• Abronia maritima
• Abronia mellifera
• Abronia nana
• Abronia pogonantha
• Abronia turbinata
• Abronia umbellata
  • Abronia umbellata acutalata
  • Abronia umbellata breviflora
• Abronia villosa
  • Abronia villosa var. aurita

•  
• Abrus
• Abrus aureus (Madagascar)
• Abrus baladensis (Somalia)
• Abrus bottae (Saudi Arabia, Yemen)
• Abrus canescens (Africa)
• Abrus diversifoliatus (Madagascar)
• Abrus fruticulosus (India)
• Abrus gawenensis (Somalia)
• Abrus laevigatus (Southern Africa)
• Abrus longibracteatus (Laos, Vietnam)
• Abrus madagascariensis (Madagascar)
• Abrus parvifolius (Madagascar)
• Abrus precatorius (Africa, Australia, Southeast Asia)
• Abrus pulchellus (Africa)
• Abrus sambiranensis (Madagascar)
• Abrus schimperi (Africa)
• Abrus somalensis (Somalia)
• Abrus wittei (Zaire)

•  
• Abutilon
• A. abutiloides – Bushy Abutilon
• A. albescens
• A. auritum – Asian Indian Mallow
• A. bedfordianum – Bedford's Mallow
• A. berlandieri – Berlandier's Indian Mallow
• A. bidentatum
• A. buchii
• A. darwinii – Darwin's Mallow
• A. eremitopetalum – Hiddenpetal Indian Mallow
• A. fruticosum – Texas Indian Mallow
• A. giganteum
• A. grandiflorum
• A. grandifolium – Hairy Indian Mallow
• A. greveanum
• A. hirtum – Hairy Abutilon
• A. hulseanum
• A. hypoleucum – Whiteleaf Indian Mallow
• A. incanum – Hoary Abutilon
• A. indicum – Indian Mallow
• A. insigne
• A. julianae
• A. lauraster
• A. leonardi – Woolly Abutilon
• A. leucopetalum
• A. listeri
• A. longicuspe
• A. malacum – Yellow Indian Mallow
• A. mauritianum
• A. megapotamicum – Trailing Abutilon
• A. menziesii
• A. mollicomum – Sonoran Indian Mallow
• A. mollissimum
• A. muticum
• A. niveum – White-flowered Abutilon
• A. palmeri – Palmer's Indian Mallow
• A. parishii – Parish's Indian Mallow
• A. parvulum – Dwarf Indian Mallow
• A. pauciflorum – Woolly Abutilon
• A. permolle – Velvety Abutilon
• A. pictum – Redvein Abutilon, Red Vein Indian Mallow
• A. pitcairnense
• A. purpurascens
• A. reflexum
• A. ramiflorum
• A. reventum – Yellowflower Indian Mallow
• A. sachetianum
• A. sandwicense – Greenflower Indian Mallow
• A. sellowianum
• A. theophrasti – Velvetleaf, Indian Mallow, Butterweed
• A. thurberi – Thurber's Indian Mallow
• A. thyrsodendron
• A. trisulcatum
• A. venosum
• A. virginianum – Virgin Islands Abutilon
• A. wrightii
•  

Hybrids

• Abutilon × hybridum – Chinese Lantern
• Abutilon × milleri (A. megapotamicum × A. pictum)
• Abutilon × suntense (A. ochsenii × A. vitifolium)

•  
• Acacia (Wattle)

• Acacia aneura

  Acacia auriculiformis

  Acacia baileyana

  Acacia berlandieri

  Acacia catechu

  Acacia collinsii

  Acacia confusa

  Acacia constricta

  Acacia covenyi

  Acacia dealbata

  Acacia decurrens

  Acacia denticulosa

  Acacia drummondii

  Acacia erioloba

  Acacia estrophiolata

  Acacia fimbriata

  Acacia greggii

  Acacia heterophylla

  Acacia longifolia

  Acacia melanoxylon

  Acacia pennata

  Acacia saligna

  Acacia schinoides

  Acacia tetragonophylla

•  
• Acaena
• Acaena adscendens
• Acaena anserinifolia
• Acaena argentea
• Acaena buchananii
• Acaena caesiiglauca
• Acaena dumicola
• Acaena emittens
• Acaena exigua
• Acaena fissistipula
• Acaena glabra
• Acaena inermis
• Acaena juvenca
• Acaena laevigata
• Acaena lucida
• Acaena magellanica
• Acaena microphylla
• Acaena minor
• Acaena myriophylla
• Acaena novae-zelandiae
• Acaena ovalifolia
• Acaena ovina
• Acaena pallida
• Acaena pinnatifida
• Acaena platyacantha
• Acaena pumila
• Acaena rorida
• Acaena saccaticupula
• Acaena sanguisorbae
• Acaena sericea
• Acaena splendens
• Acaena tesca
• Acaena trifida

•  
• Acalypha
• Acalypha alopecuroides
• Acalypha amentacea
• Acalypha andina
• Acalypha arvensis
• Acalypha australis
• Acalypha bipartita
• Acalypha bisetosa
• Acalypha californica
• Acalypha chlorocardia
• Acalypha chuniana
• Acalypha ciliata
• Acalypha costaricensis
• Acalypha dictyoneura
• Acalypha diversifolia
• Acalypha ecuadorica
• Acalypha eggersii
• Acalypha fruticosa
• Acalypha glabrata
• Acalypha gracilens
• Acalypha gummifera
• Acalypha hispida
• Acalypha hontauyuensis
• Acalypha indica
• Acalypha integrifolia
• Acalypha klavea
• Acalypha × lancasteri
• Acalypha lancetillae
• Acalypha lepinei
• Acalypha leptopoda
• Acalypha macrostachya
• Acalypha monococca
• Acalypha mortoniana
• Acalypha ornata
• Acalypha ostryifolia
• Acalypha pendula
• Acalypha phleoides
• Acalypha polystachya
• Acalypha portoricensis
• Acalypha psilostachya
• Acalypha radians
• Acalypha raivavensis
• Acalypha repens
• Acalypha reptans
• Acalypha rhomboidea
• Acalypha rubrinervis
• Acalypha schimpffii
• Acalypha setosa
• Acalypha siamensis
• Acalypha skutchii
• Acalypha sonderiana
• Acalypha suirenbiensis
• Acalypha tunguraguae
• Acalypha umbrosa
• Acalypha villicaulis
• Acalypha villosa
• Acalypha virginica
• Acalypha wilkesiana

•  
• Acantholimon (Prickly thrift)
• Acantholimon albertii
• Acantholimon avenaceum
• Acantholimon glumaceum
• Acantholimon göksunicum
• Acantholimon köycegizicum
• Acantholimon venustum

•  
• Acanthophoenix (Barbel Palm,  Red Barbel Palm)
• Acanthophoenix rubra
•  
• Acanthus
• Acanthus balcanicus
• Acanthus dioscoridis
• Acanthus ebracteatus
• Acanthus eminens
• Acanthus hirsutus
• Acanthus ilicifolius
• Acanthus mollis
• Acanthus montanus
• Acanthus polystachyus
• Acanthus spinosus
• Acanthus syriacus

•  
• Acca (Feijoa)
• Acca sellowiana
•  
• Acer (Maple)
• Acer albopurpurascens
• Acer acuminatum
• Acer aidzuense
• Acer ambiguum
• Acer amplum
• Acer argutum
• Acer barbatum
• Acer barbinerve
• Acer buergerianum
• Acer caesium
• Acer calcaratum
• Acer campbellii
• Acer campestre
• Acer capillipes
• Acer cappadocicum
• Acer carpinifolium
• Acer caudatifolium
• Acer caudatum
• Acer ceriferum
• Acer chapaense
• Acer cinnamomifolium
• Acer circinatum
• Acer circumlobatum
• Acer cissifolium
• Acer confertifolium
• Acer cordatum
• Acer coriaceifolium
• Acer crassum
• Acer crataegifolium
• Acer creticum
• Acer davidii
• Acer diabolicum
• Acer discolor
• Acer distylum
• Acer duplicatoserratum
• Acer elegantulum
• Acer erianthum
• Acer erythranthum
• Acer eucalyptoides
• Acer fabri
• Acer fedschenkoanum
• Acer fengii
• Acer fenzelianum
• Acer flabellatum
• Acer floridanum
• Acer forrestii
• Acer franchetii
• Acer garrettii
• Acer ginnala
• Acer giraldii
• Acer glabrum
• Acer granatense
• Acer grandidentatum
• Acer griseum
• Acer grosseri
• Acer hainanense
• Acer heldreichii
• Acer henryi
• Acer hersii
• Acer hyrcanum
• Acer insulare
• Acer japonicum
• Acer kiukiangense
• Acer komarovii
• Acer kuomeii
• Acer kweilinense
• Acer laevigatum
• Acer lampingense
• Acer laurinum
• Acer laxiflorum
• Acer leipoense
• Acer leucoderme
• Acer linganense
• Acer lobelii
• Acer longipes
• Acer lucidum
• Acer macrophyllum
• Acer mandshuricum
• Acer mapienense
• Acer maximowiczianum
• Acer maximowiczii
• Acer miaoshanicum
• Acer miaotaiense‎
• Acer micranthum
• Acer miyabei
• Acer mono
• Acer monspessulanum
• Acer montanum
• Acer morifolium
• Acer nayongense
• Acer negundo
• Acer nikoense
• Acer nigrum
• Acer nipponicum
• Acer oblongum
• Acer obtusifolium
• Acer olivaceum
• Acer oliverianum
• Acer opalus
• Acer opulifolium
• Acer orientale
• Acer palmatum
• Acer pauciflorum
• Acer paxii
• Acer pectinatum
• Acer pensylvanicum
• Acer pentaphyllum
• Acer pentapomicum
• Acer pictum
• Acer pilosum
• Acer platanoides
• Acer pseudoplatanus
• Acer pseudosieboldianum
• Acer pubescens
• Acer pubipalmatum
• Acer pycnanthum
• Acer regelii
• Acer robustum
• Acer rubescens
• Acer rubrum
• Acer rufinerve
• Acer saccharinum
• Acer saccharum
• Acer schneiderianum
• Acer semenovii
• Acer sempervirens
• Acer serrulatum
• Acer shangszeense
• Acer shihweii
• Acer shirasawanum
• Acer sichourense
• Acer sieboldianum
• Acer sikkimense
• Acer sinense
• Acer sino-oblongum
• Acer sinopurpurascens
• Acer skutchii
• Acer spicatum
• Acer stachyophyllum
• Acer sterculiaceum
• Acer sunyiense
• Acer sutchuenense
• Acer sycopseoides
• Acer syriacum
• Acer taipuense
• Acer tataricum
• Acer tegmentosum
• Acer tenellum
• Acer tetramerum
• Acer tibetense
• Acer tonkinense
• Acer trautvetteri
• Acer trilobatum
• Acer triflorum
• Acer truncatum
• Acer tschonoskii
• Acer tutcheri
• Acer ukurunduense
• Acer undulatum
• Acer vanvolxemii
• Acer velutinum
• Acer villosum
• Acer wangchii
• Acer wardii
• Acer wilsonii
• Acer wuyuanense
• Acer yangbiense
• Acer yaoshanicum
• Acer yinkunii
• Acer yuii

•  
• Achillea (yarrow)

• Achimenantha (hybrid genus)
• Achimenes
• Acinos (calamint)
• Aciphylla
• Acmena
• Acoelorraphe (saw palm)
• Acokanthera
• Aconitum (aconite, monkshood)
•  
• Acorus

• Acorus americanus

  Acorus calamus

  Acorus gramineus

  Acorus triqueter

  Acorus latifolius

  Acorus xiangyeus

•  
• Acradenia
• Acrocomia
• Actaea (baneberry)
•  
• Actinidia (Kiwi)
• Actinidia arguta
• Actinidia arisanensis
• Actinidia callosa
• Actinidia carnosifolia
• Actinidia chengkouensis
• Actinidia chinensis
• Actinidia chrysantha
• Actinidia cinerascens
• Actinidia cordifolia
• Actinidia coriacea
• Actinidia cylindrica
• Actinidia deliciosa
• Actinidia eriantha
• Actinidia farinosa
• Actinidia fasciculoides
• Actinidia fortunatii
• Actinidia fulvicoma
• Actinidia glauco-callosa
• Actinidia glaucophylla
• Actinidia globosa
• Actinidia gracilis
• Actinidia grandiflora
• Actinidia hemsleyana
• Actinidia henryi
• Actinidia holotricha
• Actinidia indochinensis
• Actinidia kolomikta
• Actinidia laevissima
• Actinidia lanceolata
• Actinidia latifolia
• Actinidia leptophylla
• Actinidia liangguangensis
• Actinidia macrosperma
• Actinidia maloides
• Actinidia melanandra
• Actinidia melliana
• Actinidia obovata
• Actinidia pilosula
• Actinidia polygama
• Actinidia purpurea
• Actinidia rubricaulis
• Actinidia rubus
• Actinidia rudis
• Actinidia rufa
• Actinidia rufotricha
• Actinidia sabiaefolia
• Actinidia sorbifolia
• Actinidia stellato-pilosa
• Actinidia styracifolia
• Actinidia suberifolia
• Actinidia tetramera
• Actinidia trichogyna
• Actinidia ulmifolia
• Actinidia umbelloides
• Actinidia valvata
• Actinidia vitifolia

•  
• Ada
• Adansonia
• Adenandra
• Adenanthos
• Adenia
• Adenium
• Adenocarpus
• Adenophora
• Adenostoma
• Adiantum (maidenhair fern)
• Adlumia
•  
• Adonis
• Adonis aestivalis
• Adonis aleppica
• Adonis amurensis
• Adonis annua
• Adonis bobroviana
• Adonis chrysocyathus
• Adonis coerulea
• Adonis cyllenea
• Adonis davidii
• Adonis dentata
• Adonis distorta
• Adonis flammea
• Adonis microcarpa
• Adonis nepalensis
• Adonis palaestina
• Adonis pyrenaica
• Adonis ramosa
• Adonis sibirica
• Adonis sutchuenensis
• Adonis tianschanica
• Adonis vernalis
• Adonis volgensis

•  
• Adromischus
• Aechmea
• Aegopodium
• Aeonium
• Aerangis (an orchid genus)
• Aerides (an orchid genus)
• Aeschynanthus
•  
• Aesculus (Buckeye or Chestnut)
• Aesculus arguta: Texas Buckeye
• Aesculus californica: California Buckeye
• Aesculus × carnea: Red Horse Chestnut
• Aesculus chinensis: Chinese Horse Chestnut
• Aesculus chinensis var. wilsonii: Wilson's Horse Chestnut
• Aesculus flava (A. octandra): Yellow Buckeye
• Aesculus glabra: Ohio Buckeye
• Aesculus hippocastanum: Common Horse Chestnut
• Aesculus indica: Indian Horse Chestnut
• Aesculus neglecta: Dwarf Buckeye
• Aesculus parviflora: Bottlebrush Buckeye
• Aesculus parryi
• Aesculus pavia: Red Buckeye
• Aesculus pavia var. flavescens: Texas Yellow Buckeye, Yellow Woolly Buckeye
• Aesculus sylvatica: Painted Buckeye
• Aesculus turbinata: Japanese Horse Chestnut
• Aesculus wangii = Aesculus assamica

•  
• Aethionema
• Afgekia
• Agapanthus
• Agapetes
• Agastache
• Agathis
• Agathosma
•  
• Agave
• Agave aboriginum
• Agave abortiva
• Agave abrupta
• Agave acicularis
• Agave acklinicola
• Agave affinis
• Agave × ajoensis
• Agave aktites
• Agave albescens
• Agave albomarginata
• Agave alibertii
• Agave aloides
• Agave amaniensis
• Agave americana
• Agave angustiarum
• Agave angustifolia
• Agave angustissima
• Agave anomala
• Agave antillarum
  • Agave antillarum var. grammontensis
• Agave applanata
• Agave arizonica
• Agave arubensis
• Agave aspera
• Agave asperrima
• Agave atrovirens
• Agave atrovirens var. mirabilis
• Agave attenuata
• Agave aurea
• Agave avellanidens
• Agave bahamana
• Agave bakeri
• Agave banlan
• Agave barbadensis
• Agave baxteri
• Agave bergeri
• Agave bernhardi
• Agave boldinghiana
• Agave bollii
• Agave botterii
• Agave bouchei
• Agave bourgaei
• Agave bovicornuta
• Agave braceana
• Agave brachystachys
• Agave bracteosa
• Agave brandegeei
• Agave brauniana
• Agave breedlovei
• Agave brevipetala
• Agave breviscapa
• Agave brevispina
• Agave brittonia
• Agave bromeliaefolia
• Agave brunnea
• Agave bulbifera
• Agave cacozela
• Agave cajalbanensis
• Agave calderoni
• Agave calodonta
• Agave campanulata
• Agave cantala
• Agave cantula
• Agave capensis
• Agave carchariodonta
• Agave caribaea
• Agave caribiicola
• Agave carminis
• Agave caroli-schmidtii
• Agave caymanensis
• Agave celsii
• Agave cernua
• Agave cerulata
  • Agave cerulata ssp. subcerulata
• Agave chiapensis (syn. Agave polyacantha)
• Agave chihuahuana
• Agave chinensis
• Agave chisosensis
• Agave chloracantha
• Agave chrysantha
• Agave chrysoglossa
• Agave coccinea
• Agave cocui
• Agave coespitosa
• Agave colimana
• Agave collina
• Agave colorata
• Agave compacta
• Agave complicata
• Agave compluviata
• Agave concinna
• Agave congesta
• Agave conjuncta
• Agave connochaetodon
• Agave consociata
• Agave convallis
• Agave corderoyi
• Agave costaricana
• Agave cucullata
• Agave cundinamarcensis
• Agave cupreata
• Agave dasyliriodes
• Agave datylio
• Agave davilloni
• Agave de-meesteriana
• Agave dealbata
• Agave deamiana
• Agave debilis
• Agave decaisneana
• Agave decipiens
• Agave delamateri
• Agave densiflora
• Agave dentiens
• Agave deserti
  • Agave deserti ssp. simplex
• Agave desmettiana
• Agave diacantha
• Agave difformis
• Agave disceptata
• Agave disjuncta
• Agave dissimulans
• Agave donnell-smithii
• Agave durangensis
• Agave dussiana
• Agave eborispina
• Agave echinoïdes
• Agave eduardi
• Agave eggersiana
• Agave ehrenbergii
• Agave eichlami
• Agave ekmani
• Agave elizae
• Agave ellemeetiana
• Agave endlichiana
• Agave engelmanni
• Agave entea
• Agave erosa
• Agave evadens
• Agave excelsa
• Agave expatriata
• Agave falcata
  • Agave falcata var. espadina
  • Agave falcata var. microcarpa
• Agave felgeri
• Agave felina
• Agave fenzliana
• Agave ferdinandi-regis
• Agave filifera
  • Agave filifera subsp. microceps
• Agave flaccida
• Agave flaccifolia
• Agave flavovirens
• Agave flexispina
• Agave fortiflora
• Agave fourcroydes
  • Agave fourcroydes var. espiculata
• Agave fragrantissima
• Agave franceschiana
• Agave franzosinii
• Agave friderici
• Agave funifera
• Agave funkiana
• Agave galeottei
• Agave garciae-mendozae
• Agave geminiflora
  • Agave geminiflora var. filifera
• Agave gentryi
• Agave ghiesbrechtii
• Agave glabra
• Agave glaucescens
• Agave goeppertiana
• Agave glomeruliflora
• Agave gracilipes
• Agave gracilis
• Agave grandibracteata
• Agave granulosa
• Agave grenadina
• Agave grijalvensis
• Agave grisea
• Agave guadalajarana
• Agave guatemalensis
• Agave guedeneyri
• Agave guiengola
• Agave gutierreziana
• Agave guttata
• Agave gypsophila
• Agave hanburii
• Agave harrisii
• Agave hartmani
• Agave haseloffii
• Agave hauniensis
• Agave havardiana
• Agave haynaldi
• Agave henriquesii
• Agave hexapetala
• Agave hiemiflora
• Agave hookeri
• Agave horizontalis
• Agave horrida
• Agave houghii
• Agave huachucaensis
• Agave huehueteca
• Agave humboldtiana
• Agave hurteri
• Agave impressa
• Agave inaequidens
• Agave inaguensis
• Agave indagatorum
• Agave ingens
• Agave inopinabilis
• Agave integrifolia
• Agave intermixta
• Agave intrepida
• Agave isthmensis
• Agave jaiboli
• Agave jarucoensis
• Agave karatto
• Agave kellermaniana
• Agave kerchovei
• Agave kewensis
• Agave kirchneriana
• Agave lagunae
• Agave langlassei
• Agave laticincta
• Agave latifolia
• Agave laurentiana
• Agave laxa
• Agave laxifolia
• Agave lechuguilla
• Agave lemairei
• Agave lempana
• Agave lespinassei
• Agave lindleyi
• Agave littaeaoides
• Agave longipes
• Agave longisepala
• Agave lophantha
• Agave lurida
• Agave macrantha
• Agave macroculmis
• Agave maculata
• Agave madagascariensis
• Agave mapisaga
• Agave margaritae
• Agave marmorata
• Agave martiana
• Agave maximiliana
• Agave maximowicziana
• Agave mayoensis
• Agave mckelveyana
• Agave medioxima
• Agave megalacantha
• Agave melanacantha
• Agave melliflua
• Agave mexicana
• Agave micracantha
• Agave millspaughii
• Agave minarum
• Agave mirabilis
• Agave mitis
• Agave monostachya
• Agave montana
• Agave montserratensis
• Agave moranii
• Agave morrisii
• Agave muilmanni
• Agave mulfordiana
• Agave multifilifera
• Agave multiflora
• Agave multilineata
• Agave murpheyi
• Agave nashii
• Agave nayaritensis
• Agave neglecta
• Agave nelsoni
• Agave nevadensis
• Agave nevidis
• Agave newberyi
• Agave nickelsi
• Agave nissoni
• Agave nizandensis
• Agave noli-tangere
• Agave obducta
• Agave oblongata
• Agave obscura
• Agave ocahui
  • Agave ocahui var. longifolia
• Agave offoyana
• Agave oligophylla
• Agave oliverana
• Agave opacidens
• Agave orcuttiana
• Agave ornithobroma
• Agave oroensis
• Agave ovatifolia
• Agave oweni
• Agave pachyacantha
• Agave pachycentra
• Agave pacifica
• Agave pallida
• Agave palmaris
• Agave palmeri
• Agave pampaniniana
• Agave panamana
• Agave papyriocarpa
• Agave parryi
  • Agave parryi var. truncata
• Agave parvidentata
• Agave parviflora
  • Agave parviflora subsp. flexiflora
• Agave patonii
• Agave paucifolia
• Agave paupera
• Agave pavoliniana
• Agave peacockii
• Agave pedrosana
• Agave pedunculifera
• Agave pelona
• Agave perplexans
• Agave pes-mulae
• Agave petiolata
• Agave petrophila
• Agave phillipsiana
• Agave picta
• Agave planera
• Agave polianthiflora
• Agave polianthoides
• Agave portoricensis
• Agave potatorum
• Agave potosina
• Agave potrerana
• Agave prainiana
• Agave promontorii
• Agave prostrata
• Agave protuberans
• Agave pruinosa
• Agave pseudotequilana
• Agave pugioniformis
• Agave pulcherrima
• Agave pulchra
• Agave pumila
• Agave punctata
• Agave purpurea
• Agave purpusorum
• Agave pygmae
• Agave quadrata
• Agave quiotifera
• Agave ragusae
• Agave rasconensis
• Agave regia
• Agave revoluta
• Agave rhodacantha
• Agave rigida
• Agave roezliana
• Agave rudis
• Agave rupicola
  • Agave rupicola var. brevifolia
  • Agave rupicola var. longifolia
  • Agave rupicola var. rubridentata
• Agave rutteniae
• Agave rzedowskiana

• Agave salmdyckii
• Agave salmiana
  • Agave salmiana var. angustifolia
  • Agave salmiana var. cochlearis
• Agave samalana
• Agave sartorii
• Agave scaphoidea
• Agave scaposa
• Agave scheuermaniana

• Agave schildigera
• Agave schneideriana
• Agave schottii
  • Agave schottii var. serrulata
• Agave scolymus
  • Agave scolymus var. polymorpha
• Agave sebastiana
• Agave seemanniana
  • Agave seemanniana var. perscabra
• Agave serrulata
• Agave sessiliflora
• Agave shaferi
• Agave shawii
• Agave shrevei
  • Agave shrevei ssp. magna
  • Agave shrevei ssp. matapensis
• Agave sicaefolia
• Agave simoni
• Agave sisalana
• Agave sleviniana
• Agave smithiana
• Agave sobolifera
  • Agave sobolifera f. spinidentata
• Agave sobria
  • Agave sobria ssp. frailensis
• Agave sordida
• Agave striata
  • Agave striata var. mesae
• Agave stricta
• Agave stringens
• Agave subinermis
• Agave subsimplex
• Agave subtilis
• Agave subzonata
• Agave sullivani
• Agave tecta
• Agave tenuifolia
• Agave tenuispina
• Agave teopiscana
• Agave tequilana
• Agave terraccianoi
• Agave theometel
• Agave thomasae
• Agave thomsoniana
• Agave tigrina
• Agave titanota
• Agave todaroi
• Agave toneliana
• Agave tortispina
• Agave toumeyana
  • Agave toumeyana var. bella
• Agave trankeera
• Agave troubetskoyana
• Agave tubulata
  • Agave tubulata ssp. brevituba
• Agave underwoodii
• Agave unguiculata
• Agave utahensis
  • Agave utahensis var. discreta
  • Agave utahensis var. nevadensis
• Agave van-grolae
• Agave vandervinneni
• Agave ventum-versa
• Agave vera-cruz
• Agave vernae
• Agave verschaffeltii
• Agave vestita
• Agave vicina
• Agave victoriae-reginae
  • Agave victoriae-reginae f. dentata
  • Agave victoriae-reginae f. latifolia
  • Agave victoriae-reginae f. longifolia
  • Agave victoriae-reginae f. longispina
  • Agave victoriae-reginae f. ornata
  • Agave victoriae-reginae f. stolonifera
  • Agave victoriae-reginae f. viridis
  • Agave victoriae-reginae ssp. swobodae
• Agave vilmoriniana
• Agave viridissima
• Agave vivipara
  • Agave vivipara var. cabaiensis
  • Agave vivipara var. cuebensis
• Agave vizcainoensis
• Agave wallisii
• Agave warelliana
• Agave washingtonensis
• Agave watsonii
• Agave weberi
• Agave weingartii
• Agave wendtii
• Agave wercklei
• Agave wiesenbergensis
• Agave wightii
• Agave wildingii
• Agave winteriana
• Agave wislizeni
• Agave wocomahi
• Agave woodrowii
• Agave wrightii
• Agave xylonacantha
• Agave yaquiana
• Agave yuccaefolia
  • Agave yuccifolia var. caespitosa
• Agave zapupe
• Agave zebra
• Agave zonata
• Agave zuccarinii

•  
• Ageratum
• Aglaia
• Aglaomorpha
• Aglaonema
• Agonis
• Agrimonia
• Agrostemma (corn cockle)
• Agrostis
• Aichryson
•  
• Ailanthus (Tree of Heaven)
• Ailanthus altissima (Tree of Heaven) – Northern and Central mainland China, Taiwan
• Ailanthus excelsa – India and Sri Lanka
• Ailanthus integrifolia – New Guinea and Queensland, Australia
• Ailanthus malabarica – Southeast Asia
• Ailanthus triphysa (White Siris) – Northern and Eastern Australia
• Ailanthus vilmoriniana (Downy Tree of Heaven) – Southwest China

•  
• Aiphanes
• Aira (hair grass)
• Ajania
• Ajuga (bugleweed)
• Akebia
• Alangium
• Alberta
•  
• Albizia (Silk Tree)
• Albizia acle (syn. Mimosa acle) - Acle, Akle
• Albizia acrodena
• Albizia adianthifolia
• Albizia adinocephala (syn. Pithecellobium adinocephalum)
• Albizia altissima
• Albizia amaniensis
• Albizia amara
• Albizia amoenissima
• Albizia androyensis
• Albizia angolensis
• Albizia angulata
• Albizia anthelmintica
• Albizia antunesiana
• Albizia arenicola
• Albizia arunachalensis
• Albizia atakataka
• Albizia attopeuensis
• Albizia aurisparsa
• Albizia austrobrasilica
• Albizia aylmeri
• Albizia balabaka
• Albizia barinensis
• Albizia bequaerti
• Albizia bernieri
• Albizia berteriana – Bertero Albizia
• Albizia boinensis
• Albizia boivinii – Madagascar
• Albizia bracteata
• Albizia brevifolia
• Albizia buntingii
• Albizia burkartiana
• Albizia burmanica
• Albizia calcarea
• Albizia canescens – Townsville Siris
• Albizia carbonaria – Naked Albizia, Cotton Varay
• Albizia carrii
• Albizia charpentieri
• Albizia chevalieri
• Albizia chinensis – Chinese Albizia
• Albizia commiphoroides
• Albizia comorensis
• Albizia comptonii
• Albizia conjugato-pinnata
• Albizia corbisieri
• Albizia coriaria
• Albizia coripatensis
• Albizia corniculata
• Albizia crassiramea
• Albizia deplanchei
• Albizia divaricata
• Albizia dolichadena
• Albizia dubia
• Albizia duclouxii
• Albizia edwallii
• Albizia elegans
• Albizia eriorhachis
• Albizia euryphylla
• Albizia fastigiata
• Albizia ferruginea
• Albizia flamignii
• Albizia forbesii
• Albizia fournieri
• Albizia garrettii
• Albizia gigantea
• Albizia gillardinii
• Albizia glaberrima
• Albizia glabrior
• Albizia glabripetala
• Albizia grandibracteata
• Albizia granulosa
• Albizia greveana - Madagascar
• Albizia guachapele
• Albizia guillainii
• Albizia gummifera - Ethiopia and Kenya
• Albizia harveyi
• Albizia hasslerii
• Albizia heblirgha
• Albizia inundata
• Albizia isenbergiana
• Albizia jaubertiana
• Albizia julibrissin – Persian Silk Tree, Pink Siris, Nemu Tree, Lenkoran Acacia
• Albizia kalkora - Kalkora Mimosa
• Albizia katangensis
• Albizia kostermansii
• Albizia lancangensis
• Albizia lankaensis
• Albizia lathamii
• Albizia laurentii
• Albizia lebbeck
• Albizia lebbekoides – Indian Albizia
• Albizia leonardii
• Albizia letestui
• Albizia littoralis
• Albizia lucidior
• Albizia lugardi
• Albizia macrophylla
• Albizia mahalao
• Albizia mainaea - Madagascar
• Albizia malacophylla
• Albizia masikororum
• Albizia minyi
• Albizia morombensis
• Albizia mossambicensis
• Albizia mossamedensis
• Albizia multiflora
• Albizia myriophylla
• Albizia nayaritensis
• Albizia niopoides – Tantakayo Albizia
• Albizia numidarum
• Albizia obbiadensis
• Albizia obliquifoliolata
• Albizia odorata
• Albizia odoratissima
• Albizia oliveri
• Albizia orissensis
• Albizia ortegae
• Albizia papuensis
• Albizia pedicellaris
• Albizia pedicellata
• Albizia pentzkeana
• Albizia perrieri
• Albizia petersiana
• Albizia philippinensis
• Albizia pistaciifolia
• Albizia poilanei
• Albizia poissoni
• Albizia polycephala
• Albizia polyphylla - Madagascar
• Albizia pospischilii
• Albizia procera – Tall Albizia
• Albizia retusa
• Albizia rhombifolia
• Albizia richardiana
• Albizia rosea
• Albizia rosulata
• Albizia rufa
• Albizia sahafariensis
• Albizia salomonensis
• Albizia saman – Rain Tree
• Albizia saponaria – White-flowered Albizia
• Albizia schimperiana
• Albizia sherriffii
• Albizia simeonis
• Albizia sinaloensis – Sinaloan Albizia
• Albizia splendens
• Albizia subdimidiata
• Albizia suluensis – Zulu Albizia
• Albizia tanganyicensis
  • Albizia tanganyicensis ssp. adamsoniorum
• Albizia thompsonii
• Albizia tomentella
  • Albizia tomentella var. rotundata
  • Albizia tomentella var. sumbawaensis
• Albizia tomentosa – Tomentose Albizia
• Albizia tulearensis
• Albizia umbalusiana
• Albizia vaughanii
• Albizia verrucosa
• Albizia versicolor
• Albizia vialeana
• Albizia viridis
• Albizia welwitschii
• Albizia welwitschioides
• Albizia westerhuisii
• Albizia zimmermannii
• Albizia zygia

•  
• Albuca
• Alcea (hollyhock)
• Alchemilla
• Aldrovanda
• Aleurites
• Aliceara (hybrid genus)
• Alisma (water plantain)
• Alkanna
• Allagoptera
• Allamanda
• Allium (onion)
• Allocasuarina
• Allosyncarpia
• Alloxylon
• Alluaudia
•  
• Alnus (Alder)
• Alnus acuminata — Andean Alder
• Alnus cordata — Italian Alder
• Alnus cremastogyne
• Alnus firma
• Alnus glutinosa — Black Alder
• Alnus incana — Grey Alder

• Alnus hirsuta (A. incana subsp. hirsuta) — Manchurian Alder
• Alnus oblongifolia (A. incana subsp. oblongifolia) — Arizona Alder
• Alnus rugosa (A. incana subsp. rugosa) — Speckled Alder
• Alnus tenuifolia (A. incana subsp. tenuifolia) — Thinleaf or Mountain Alder
• Alnus japonica — Japanese Alder
• Alnus jorullensis — Mexican Alder
• Alnus mandshurica
• Alnus matsumurae
• Alnus nepalensis — Nepalese Alder
• Alnus orientalis — Oriental Alder
• Alnus pendula
• Alnus rhombifolia — White Alder
• Alnus rubra — Red Alder
• Alnus serrulata — Hazel Alder, Tag Alder or Smooth Alder

• Alnus sieboldiana
• Alnus subcordata — Caucasian Alder
• Alnus trabeculosa

Subgenus Clethropsis:

• Alnus formosana — Formosan Alder
• Alnus maritima — Seaside Alder
• Alnus nitida — Himalayan Alder

Subgenus Alnobetula:

• Alnus viridis — Green Alder
  • Alnus viridis subsp. viridis
  • Alnus viridis subsp. maximowiczii (A. maximowiczii)
  • Alnus viridis subsp. crispa (A. crispa)
  • Alnus viridis subsp. sinuata (A. sinuata, Sitka Alder or Slide Alder)

•  
• Alocasia
• Alocasia acuminata (Indonesia)
• Alocasia aequiloba (New Guinea)
• Alocasia alba (Sri Lanka)
• Alocasia 'Amazonica'
• Alocasia argyrea
• Alocasia arifolia (Malaysia)
• Alocasia atropurpurea (Philippines)
• Alocasia augustiana
• Alocasia × bachi
• Alocasia balgooyi (Sulawesi)
• Alocasia beccarii (Malaysia)
• Alocasia boa (New Guinea)
• Alocasia boyceana (Philippines)
• Alocasia brancifolia (New Guinea)
• Alocasia brisbanensis (Australia)
• Alocasia cadieri (SE Asia)
• Alocasia celebica (Sulawesi)
• Alocasia × chantrieri
• Alocasia × chantrieriana
• Alocasia clypeolata (Philippines)
• Alocasia × conspicua (= A. longiloba × A.odora )
• Alocasia coriacea
• Alocasia cucullata (Indonesia)
• Alocasia culionensis (Philippines)
• Alocasia cuprea (Borneo)
• Alocasia decipiens (Indonesia)
• Alocasia decumbens (Vietnam)
• Alocasia denudata (Singapore)
• Alocasia devansayana (New Guinea)
• Alocasia evrardii (SE Asia)
• Alocasia fallax (East Himalaya to Bangladesh)
• Alocasia flabellifera (New Guinea)
• Alocasia flemingiana (Java)
• Alocasia fornicata (India, Indonesia)
• Alocasia gageana (Burma)

• Alocasia × gaulainii
• Alocasia grandis (Indonesia)
• Alocasia grata (Indonesia)
• Alocasia hainanensis (Hainan, China)
• Alocasia hainaica (Hainan to N. Vietnam)
• Alocasia heterophylla (Philippines)
• Alocasia hollrungii (New Guinea)
• Alocasia infernalis (Borneo)
• Alocasia inornata (Sumatra)
• Alocasia kerinciensis (Sumatra)
• Alocasia lancifolia (New Guinea)
• Alocasia lauterbachiana (New Guinea)
• Alocasia longiloba (Malaysia)
• Alocasia macrorrhizos (SE Asia, Australia, Pacific)
• Alocasia maquilingensis (Philippines)
• Alocasia melo (Borneo)
• Alocasia micholitziana (Philippines)
• Alocasia minuscula (Borneo)
• Alocasia monticola (New Guinea)
• Alocasia × mortfontanensis
• Alocasia navicularis (Himalaya)
• Alocasia nebula (Borneo)
• Alocasia nicolsonii (New Guinea)
• Alocasia odora (SE Asia, China)
• Alocasia pangeran (Borneo)
• Alocasia peltata (Borneo)
• Alocasia perakensis (Malaysia)
• Alocasia portei (New Guinea)
• Alocasia princeps (Malaysia)
• Alocasia principiculus (Borneo)
• Alocasia puber (Java)
• Alocasia puteri (Borneo)
• Alocasia putii (Thailand)
• Alocasia pyrospatha (New Guinea)
• Alocasia ramosii (Philippines)
• Alocasia rapiformis (Myanmar)
• Alocasia regina (Borneo)
• Alocasia reginula
• Alocasia reversa (Philippines)
• Alocasia ridleyi (Borneo)
• Alocasia robusta (Borneo)
• Alocasia × rodigasiana
• Alocasia sanderiana (Philippines)
• Alocasia sarawakensis (Borneo)
• Alocasia scabriuscula (Borneo)
• Alocasia scalprum (Philippines)
• Alocasia × sedeni
• Alocasia simonsiana (New Guinea)
• Alocasia sinuata (Philippines)
• Alocasia suhirmaniana (Sulawesi)
• Alocasia tigrina (Philippines)
• Alocasia x van-houtteana
• Alocasia venusta (Borneo)
• Alocasia wentii (New Guinea)
• Alocasia wenzellii (Philippines)
• Alocasia wongii (Borneo)
• Alocasia zebrina (Philippines)

•  
• Aloe
• Aloe aageodonta
• Aloe abyssicola
• Aloe abyssinica
• Aloe aculeata
• Aloe acutissima
• Aloe adigratana
• Aloe affinis
• Aloe africana
• Aloe ahmarensis
• Aloe albida
• Aloe albiflora
• Aloe albovestita
• Aloe alfredii
• Aloe alooides
• Aloe ambigens
• Aloe amicorum
• Aloe ammophila
• Aloe amudatensis
• Aloe andongensis
• Aloe andringritrensis
• Aloe angiensis
• Aloe angolensis
• Aloe ankoberensis
• Aloe antandroi
• Aloe arborescens
• Aloe archeri
• Aloe arenicola
• Aloe argenticauda
• Aloe aristata
• Aloe asperifolia
• Aloe audhalica
• Aloe ausana

• Aloe babatiensis
• Aloe bainesii
• Aloe bakeri
• Aloe ballii
• Aloe barbadensis
• Aloe barbertoniae
• Aloe bargalensis
• Aloe bella
• Aloe bellatula
• Aloe betsileensis
• Aloe bicomitum
• Aloe boehmii
• Aloe boiteaui
• Aloe boscawenii

• Aloe bowiea
• Aloe boylei
• Aloe brachystachys
• Aloe branddraaiensis
• Aloe brandhamii
• Aloe breviscapa
• Aloe broomii
• Aloe brunneostriata
• Aloe buchananii
• Aloe buchlohii
• Aloe buettneri
• Aloe buhrii
• Aloe bukobana
• Aloe bulbicaulis
• Aloe bulbilifera
• Aloe bullockii
• Aloe burgersfortensis
• Aloe bussei

• Aloe calcairophila
• Aloe calidophila
• Aloe cameronii
• Aloe camperi
• Aloe canarina
• Aloe candelabrum
• Aloe cannellii
• Aloe capitata
• Aloe capitata var capitata
• Aloe capitata var cipolinicola
• Aloe capitata var gniessicola
• Aloe capitata var quartziticola
• Aloe caricina
• Aloe castellorum
• Aloe catengiana
• Aloe chabaudii
• Aloe cheranganiensis
• Aloe chlorantha
• Aloe chortolirioides
• Aloe christianii
• Aloe chrysostachys
• Aloe ciliaris
• Aloe citrina
• Aloe classenii
• Aloe claviflora
• Aloe commixta
• Aloe compacta
• Aloe compressa
• Aloe compressa var. rugosquamosa

• Aloe comptonii
• Aloe confusa
• Aloe congdonii
• Aloe congolensis
• Aloe conifera
• Aloe constricta
• Aloe cooperi
• Aloe corallina
• Aloe crassipes
• Aloe cremersii
• Aloe cremnophila
• Aloe cryptoflora
• Aloe cryptopoda
• Aloe dabenorisana
• Aloe davyana
• Aloe dawei
• Aloe debrana
• Aloe decaryi
• Aloe decorsei
• Aloe decurva
• Aloe decurvidens
• Aloe defalcata
• Aloe delphinensis
• Aloe deltoideodonta
• Aloe descoingsii
• Aloe deserti
• Aloe dewetii
• Aloe dewinteri
• Aloe dhalensis
• Aloe dhufarensis
• Aloe dichotoma
• Aloe dinteri
• Aloe dispar
• Aloe divaricata
• Aloe doei
• Aloe dolomitica
• Aloe dominella
• Aloe dorothea
• Aloe duckeri
• Aloe dumetorum
• Aloe dyeri
• Aloe ecklonis
• Aloe elata
• Aloe elegans
• Aloe elgonica
• Aloe ellenbeckii
• Aloe eminens
• Aloe enotata
• Aloe eremophila
• Aloe erensii
• Aloe ericetorum
• Aloe erinacea
• Aloe eru
• Aloe erythrophylla
• Aloe esculenta
• Aloe excelsa
• Aloe falcata
• Aloe ferox
• Aloe fibrosa
• Aloe fievetii
• Aloe fleurentinorum
• Aloe flexilifolia
• Aloe forbesii
• Aloe fosteri
• Aloe fouriei
• Aloe fragilis
• Aloe framesii
• Aloe francombei
• Aloe fulleri
• Aloe gariepensis
• Aloe gerstneri
• Aloe gigas
• Aloe gilbertii
• Aloe gillilandii
• Aloe glabrescens
• Aloe globuligemma
• Aloe gloveri
• Aloe gossweileri
• Aloe gradicaulis
• Aloe graciflora
• Aloe gracilis
• Aloe graminifolia
• Aloe grandidentata
• Aloe grata
• Aloe greatheadii
  • Aloe greatheadii davyana
• Aloe greenii
• Aloe greenwayi
• Aloe grisea
• Aloe guerrai
• Aloe guillaumetii

Aloe haemanthifolia

Aloe hardyi

Aloe harlana

Aloe harmsii

Aloe haworthioides

Aloe haworthioides albiflora

Aloe hazeliana

Aloe helenae

Aloe heliderana

Aloe hemmingii

Aloe hendrickxii

Aloe hereroensis

Aloe hildebrandtii

Aloe hlangapies

Aloe howmanii

Aloe humbertii

Aloe humilis

• Aloe ibitiensis
• Aloe imalotensis
• Aloe immaculata
• Aloe inamara
• Aloe inconspicua
• Aloe inermis
• Aloe integra
• Aloe intermedia
• Aloe inyangensis
• Aloe isaloensis
• Aloe itremensis
• Aloe jacksonii
• Aloe jucunda
• Aloe juddii
• Aloe juvenna
• Aloe karasbergensis
• Aloe keayi
• Aloe kedongensis
• Aloe keithii
• Aloe ketabrowniorum
• Aloe kilifiensis
• Aloe kirkii
• Aloe khamiesensis
• Aloe kniphofioides
• Aloe komaggasensis
• Aloe komatiensis
• Aloe krapohliana
• Aloe krausii
• Aloe kulalensis
• Aloe labworana
• Aloe laeta
  • Aloe lateritia graminicola
• Aloe lastii
• Aloe lareritia
  • Aloe lateritia graminicola
• Aloe latifolia
• Aloe lavranosii
• Aloe leachii
• Aloe leandrii
• Aloe leedalii
• Aloe lensayuensis
• Aloe lepida
• Aloe leptophylla
• Aloe leptosyphon
• Aloe lettyae
• Aloe leucantha
• Aloe linearifolia
• Aloe lineata
• Aloe littoralis
• Aloe longibracteata
• Aloe luapulana
• Aloe lutescens
• Aloe macleayi
• Aloe macloughinii
• Aloe macrantha
• Aloe macrocarpa
• Aloe macroclada
• Aloe macrosiphon
• Aloe maculata
• Aloe madecassa
• Aloe marlothii
• Aloe marsabitensis
• Aloe massawana
• Aloe mawii
• Aloe mayottensis
• Aloe medishiana
• Aloe megalacantha
• Aloe melanacantha
• Aloe menachensis
• Aloe mendesii
• Aloe menyhartii
• Aloe meruana
• Aloe metallica
• Aloe meyeri
• Aloe microcantha
• Aloe microdonta
• Aloe microstigma
• Aloe millotii
• Aloe milne-redheadii
• Aloe minima
• Aloe modesta
• Aloe moledarana
• Aloe monotropa
• Aloe monteiroi
• Aloe monticola
• Aloe morijensis
• Aloe morogoroensis
• Aloe mubendiensis
• Aloe mudenensis
• Aloe multicolor
• Aloe munchii
• Aloe murina
• Aloe musapana
• Aloe mutabilis
• Aloe mutans
• Aloe myriacantha
• Aloe mzinbana
• Aloe namibensis
• Aloe ngongensis
• Aloe niebuhriana
• Aloe nobilis
• Aloe nubigena
• Aloe nuttii
• Aloe nyeriensis
• Aloe obscura
• Aloe officinalis
• Aloe ortholopha
• Aloe otallensis
• Aloe pachygaster
• Aloe palmiformis
• Aloe parellifolia
• Aloe parvibracteata
• Aloe parvidens
• Aloe parviflora
• Aloe parvula
• Aloe patersonii
• Aloe pearsonii
• Aloe peckii
• Aloe peglerae
• Aloe pendens
• Aloe penduliflora
• Aloe percrassa
• Aloe perfoliata
• Aloe perrieri
• Aloe petricola
• Aloe petrophila
• Aloe peyrierasii
• Aloe pirottae
• Aloe plicatilis
• Aloe plowesii
• Aloe pluridens
• Aloe pole-evansii
• Aloe polyphylla
• Aloe powysiorum
• Aloe pretoriensis
• Aloe princeae
• Aloe x principis
• Aloe prinslooi
• Aloe procera
• Aloe pruinosa
• Aloe pubescens
• Aloe purpurascens
• Aloe pustuligemma
• Aloe rabaiensis
• Aloe rauhii
• Aloe reitzii
• Aloe retrospiciens
• Aloe reynoldsii
• Aloe rhodesiana
• Aloe richardiae
• Aloe richtersveldensis
• Aloe rigens
• Aloe rivae
• Aloe rivieri
• Aloe rubriflora
• Aloe rubroviolacea
• Aloe rugosifolia
• Aloe runcinata
• Aloe rupestris
• Aloe rupicola
• Aloe ruspoliana
• Aloe sabaea
• Aloe salm-dyckiana
• Aloe saponaria
• Aloe saundersdiae
• Aloe scabrifolia
• Aloe schelpei
• Aloe schliebenii
• Aloe schoellerii
• Aloe schomeri
• Aloe schweinfurthii
• Aloe scobinifolia
• Aloe scorpioides
• Aloe secundiflora
• Aloe sereti
• Aloe serriyensis
• Aloe sessilifora
  • Aloe sessiliflora vryheidensis
• Aloe sheilae
• Aloe silicola
• Aloe simii
• Aloe sinana
• Aloe sinkatana
• Aloe sladeniana
• Aloe somaliensis
  • Aloe somaliensis marmorata
  • Aloe somliensis somaliensis
• Aloe sophie
• Aloe soutpansbergensis
• Aloe speciosa
• Aloe spicata
• Aloe splendens
• Aloe squarrosa
• Aloe steudneri
• Aloe striatula
• Aloe stuhlmannii
• Aloe suarezensis
• Aloe subacutissima
• Aloe succotrina
• Aloe suffulta
• Aloe suprafoliata
• Aloe suzannae
• Aloe swynnertonii
• Aloe tenuior
• Aloe thompsoniae
• Aloe thorncroftii
• Aloe thraskii
• Aloe tidmarshii
• Aloe tomentosa
• Aloe tororoana
• Aloe torrei
• Aloe trachyticola
• Aloe transvaalensis
• Aloe trigonantha
• Aloe trothae
• Aloe tugenensis
• Aloe turkanensis
• Aloe tweediae
• Aloe ukambensis
• Aloe umbellata
• Aloe umfuloziensis
• Aloe vacillans
• Aloe vallaris
• Aloe vanbalenii
• Aloe vandermerwei
• Aloe vaombe
• Aloe vaotsanda
• Aloe variegata
• Aloe venenosa
• Aloe venusta
• Aloe vera
• Aloe verdoorniae
• Aloe verecunda
• Aloe verrucosospinosa
• Aloe versicolor
• Aloe veseyi
• Aloe viguieri
• Aloe viridiflora
• Aloe vituensis
• Aloe vogtsii
• Aloe volkensii
• Aloe vossii
• Aloe vryheidensis
• Aloe vulgaris
• Aloe whitcombei
• Aloe wickensii
• Aloe x winteri
• Aloe wildii
• Aloe wilsonii
• Aloe wollastonii
• Aloe woolliana
• Aloe wrefordii
• Aloe yavellana
• Aloe yemenica
• Aloe zanzibarica

•  
• Aloinopsis
• Alonsoa
• Alopecurus (foxtail grass)
• Aloysia
• Alphitonia
• Alpinia (ginger lily)
• Alsobia
• Alstonia
• Alstroemeria
• Alternanthera
• Althaea
• Alyogyne
• Alyssum
• Alyxia
• Amaranthus
• Amarcrinum (hybrid genus)
• Amarygia (hybrid genus)
• Amaryllis
• Amberboa
•  
• Amelanchier
• Amelanchier alnifolia - Saskatoon Serviceberry, Alder-leaved Shadbush
• Amelanchier amabilis - Lovely Shadbush
• Amelanchier arborea - Downy Shadbush
• Amelanchier bartramiana - Mountain Shadbush
• Amelanchier canadensis - Eastern Shadbush
• Amelanchier humilis - Low Shadbush
• Amelanchier interior - Wiegand's Shadbush
• Amelanchier laevis - Smooth Shadbush
• Amelanchier nantucketensis - Nantucket Serviceberry
• Amelanchier ovalis - Snowy Mespilus
• Amelanchier sanguinea - Red-twigged Shadbush
• Amelanchier sinica - Chinese Serviceberry
• Amelanchier spicata - Thicket Shadbush
• Amelanchier utahensis - Utah Serviceberry

•  
• Amesiella
• Amherstia
• Amicia
• Ammi
• Ammobium
• Amorpha
• Amorphophallus
• Ampelopsis
• Amsonia
• Anacampseros
• Anacardium
• Anacyclus
• Anagallis (pimpernel)
•  
• Ananas (Pineapple)
• Ananas ananassoides
• Ananas bracteatus
  • b. var. tricolor
• Ananas comosus
  • b. var. variegatus
• Ananas erectifolius
• Ananas fritzmuelleri
• Ananas lucidus
• Ananas nanus
• Ananas parguazensis

•  
• Anaphalis
• Anchusa
• Andersonia
• Andira
• Androlepis
• Andromeda
• Andropogon
• Androsace
• Anemia
• Anemone (windflower)
• Anemonella
• Anemonopsis
• Anemopaegma
• Anethum (dill)
• Angelica
• Angelonia
• Angiopteris
• Angophora
• Angraecum (an orchid genus)
• Anguloa (an orchid genus)
• Angulocaste (a hybrid orchid genus)
• Anigozanthos
• Anisacanthus
• Anisodontea
• Annona
• Anoda
• anodelferia
• Anomatheca (See Freesia)
• Anopterus
• Anredera
• Antennaria
• Anthemis
• Anthericum
• Anthocleista
• Anthotroche
• Anthriscus
• Anthurium
• Anthyllis
• Antidesma
• Antigonon
• Antirrhinum (snapdragon)
• Apera
• Aphelandra
• Aphyllanthes
• Apium
• Apocynum
• Aponogeton
• Apophyllum
• Apodytes
• Aponogeton
• Aporocactus
• Aporoheliocereus (hybrid genus)
• Aprevalia
• Aptenia
• Aquilegia (columbine)
• Arabis (rock cress)
• Arachis
• Arachniodes
• Arachnis (scorpion orchid) (orchid genus)
• Araeococcus
• Araiostegia
•  
• Aralia
• Aralia apioides
• Aralia armata
• Aralia atropurpurea
• Aralia bicrenata
• Aralia bipinnata
• Aralia cachemirica
• Aralia caesia
• Aralia californica - California Aralia
• Aralia castanopsiscola
• Aralia chapaensis
• Aralia chinensis - Chinese Angelica Tree
• Aralia continentalis
• Aralia cordata - Japanese Spikenard
• Aralia dasyphylla
• Aralia dasyphylloides
• Aralia debilis
• Aralia decaisneana
• Aralia delavayi
• Aralia echinocaulis
• Aralia elata - Japanese Angelica Tree
• Aralia fargesii
• Aralia ferox
• Aralia finlaysoniana
• Aralia foliolosa
• Aralia fragrans
• Aralia frodiniana
• Aralia gigantea
• Aralia gintungensis
• Aralia glabra
• Aralia glabrifoliolata
• Aralia henryi
• Aralia hispida - Bristly Spikenard
• Aralia houheensis
• Aralia humilis
• Aralia kansuensis
• Aralia kingdon-wardii
• Aralia laevis
• Aralia malabarica
• Aralia melanocarpa
• Aralia merrillii
• Aralia mexicana
• Aralia montana
• Aralia nguyen-taoi
• Aralia nudicaulis - "Wild Sarsaparilla", Small Spikenard
• Aralia parasitica
• Aralia plumosa
• Aralia racemosa - American Spikenard
• Aralia regeliana
• Aralia rex
• Aralia ryukyuensis
• Aralia scopulorum
• Aralia searelliana
• Aralia soratensis
• Aralia spinifolia
• Aralia spinosa - Devil's Walkingstick
• Aralia stellata
• Aralia stipulata
• Aralia subcordata
• Aralia thomsonii
• Aralia tibetana
• Aralia tomentella
• Aralia undulata
• Aralia urticifolia
• Aralia verticillata
• Aralia vietnamensis
• Aralia warmingiana
• Aralia wilsonii
• Aralia yunnanensis

•  
• Araucaria (Monkey-puzzle)
• Section Araucaria
  • Araucaria angustifolia - Paraná Pine, Brazilian Pine, Candelabra Tree (Southeastern Brazil, Northeastern Argentina)
  • Araucaria araucana - Monkey-puzzle or Pehuén, Chile Pine (Central Chile, Western Argentina)
  • Araucaria bidwillii - Bunya-bunya (Eastern Australia)
  • Araucaria hunsteinii – Klinki (New Guinea)
• Section Eutacta
  • Araucaria bernieri (New Caledonia)
  • Araucaria biramulata (New Caledonia)

• Araucaria columnaris Cook Pine (New Caledonia)
• Araucaria cunninghamii Moreton Bay Pine, Hoop Pine (Eastern Australia, New Guinea)
• Araucaria heterophylla Norfolk Island Pine (Norfolk Island)
• Araucaria humboldtensis (New Caledonia)
• Araucaria laubenfelsii (New Caledonia)
• Araucaria luxurians (New Caledonia)
• Araucaria montana (New Caledonia)
• Araucaria muelleri (New Caledonia)
• Araucaria nemorosa (New Caledonia)
• Araucaria rulei (New Caledonia)
• Araucaria schmidii (New Caledonia)
• Araucaria scopulorum (New Caledonia)
• Araucaria subulata (New Caledonia)

•  
• Araujia
•  
• Arbutus (Madrone)

• Arbutus andrachne (Greek Strawberry Tree) - Southeastern Europe and southwestern Asia

  Arbutus canariensis (Canary Madrone) - Canary Islands

  Arbutus unedo (Strawberry Tree) - Widespread in the Mediterranean region

   

• Arbutus arizonica (Arizona Madrone) - New Mexico, Arizona and western Mexico
• Arbutus glandulosa - Central and southern Mexico
• Arbutus menziesii (Pacific Madrone) - West coast of North America
• Arbutus peninsularis - Baja California Peninsula of Mexico
• Arbutus tessellata - Mexico
• Arbutus xalapensis (Texas Madrone) - Texas, New Mexico and northeastern Mexico

•  
• Archidendron
•  
• Archontophoenix (King Palm)
• Archontophoenix alexandrae - Alexandra Palm, King Palm
• Archontophoenix cunninghamiana - Bangalow Palm, Piccabeen Palm
• Archontophoenix maxima
• Archontophoenix myolensis
• Archontophoenix purpurea - Mount Lewis King Palm
• Archontophoenix tuckeri

•  
• Arctium
• Arctostaphylos (bearberry, manzanita)
• Arctotheca
• Arctotis (African daisy)
• Ardisia
•  
• Areca
• Areca abdulrahmanii
• Areca ahmadii
• Areca andersonii
• Areca arundinacea
• Areca brachypoda
• Areca caliso
• Areca camarinensis
• Areca catechu (Betel Palm)
• Areca celebica
• Areca chaiana
• Areca concinna
• Areca congesta
• Areca costulata
• Areca dayung
• Areca furcata
• Areca glandiformis
• Areca guppyana
• Areca hutchinsoniana
• Areca insignis
  • Areca insignis var. insignis
  • Areca insignis var. moorei
• Areca ipot
• Areca jobiensis
• Areca jugahpunya
• Areca kinabaluensis
• Areca klingkangensis
• Areca laosensis
• Areca ledermanniana
• Areca macrocalyx
• Areca macrocarpa
• Areca minuta
• Areca montana
• Areca multifida
• Areca nannospadix
• Areca nigasolu
• Areca novohibernica
• Areca oxycarpa
• Areca parens
• Areca rechingeriana
• Areca rheophytica
• Areca ridleyana
• Areca rostrata
• Areca salomonensis
• Areca subacaulis
• Areca torulo
• Areca triandra
• Areca tunku
• Areca vestiaria
• Areca vidaliana
• Areca warburgiana
• Areca whitfordii

•  
• Arenaria (sandwort)
• Arenga
• Argemone (prickly poppy)
• Argyranthemum
• Argyreia
• Argyroderma
• Ariocarpus
• Arisaema
• Arisarum
• Aristea
• Aristolochia
• Aristotelia
• Armeria
• Armoracia
• Arnebia
• Arnica
•  
• Aronia (Chokeberry)
• Aronia arbutifolia
• Aronia melanocarpa
• Aronia prunifolia

•  
• Arrabidaea (See Saritaea)
• Arrhenatherum (Oat Grass)
• Artanema
• Artabotrys
• Artemisia (mugwort, sagebrush, wormwood)
• Arthrocereus
• Arthropodium
• Artocarpus
• Arum
• Aruncus
• Arundina
•  
• Arundinaria
• Arundinaria appalachiana - Hill Cane
• Arundinaria gigantea - Giant Cane
• Arundinaria tecta - Switchcane
• Arundinaria tesselata - Bamboes

•  
• Arundo
• Arundo donax – Giant Cane, Spanish Cane (south and east Mediterranean)
• Arundo formosana
• Arundo pliniana – Pliny's Reed (Mediterranean Europe)

•  
• Asarina
• Asarum (wild ginger)
• Asclepias (milkweed, silkweed)
• Ascocenda (hybrid genus) (an orchid genus)
• Ascocentrum
•  
• Asimina (Pawpaw, Indiana Banana)

• Asimina angustifolia - Slimleaf Pawpaw (Florida, Georgia, and Alabama)

  Asimina incana - Woolly Pawpaw (Florida and Georgia)

  Asimina obovata - Bigflower Pawpaw (Florida)

  Asimina parviflora - Smallflower Pawpaw (Southern States from Texas to Virginia)

  Asimina pygmea - Dwarf Pawpaw (Florida and Georgia)

  Asimina reticulata - Netted Pawpaw (Florida and Georgia)

  Asimina tetramera - Fourpetal Pawpaw (Florida)

  Asimina triloba - Common Pawpaw (From extreme southern Ontario to northern Florida)

•  
• Asparagus
• Asperula (woodruff)
• Asphodeline
• Asphodelus (asphodel)
• Aspidistra
• Asplenium
• Astelia
• Aster
• Asteranthera
• Astilbe
• Astilboides
• Astragalus (milk vetch)
• Astrantia
• Astrophytum
• Asystasia
• Atalaya
• Athamanta
• Atherosperma
• Athrotaxis
• Athyrium
• Atriplex
• Attalea
• Aubrieta
•  
• Aucuba
• Aucuba albopunctifolia Southern China
• Aucuba chinensis Southern China, Taiwan, Myanmar, northern Vietnam
• Aucuba chlorascens Southwest China (Yunnan)
• Aucuba confertiflora Southwest China (Yunnan)
• Aucuba eriobotryifolia Southwest China (Yunnan)
• Aucuba filicauda Southern China
• Aucuba himalaica Eastern Himalaya, southern China, northern Myanmar
• Aucuba japonica Southern Japan, Southern Korea, Taiwan, Southeast China
• Aucuba obcordata Southern China
• Aucuba robusta Southern China

•  
• Aulax
• Auranticarpa
• Aurinia
• Austrocedrus
• Austrocylindropuntia
• Austrostipa
• Averrhoa
• Avicennia
• Azadirachta
• Azalea
•  
• Azara
• Azara alpina
• Azara celastrina
• Azara dentata
• Azara integrifolia - Goldspire Azara
• Azara lanceolata - Lanceleaf Azara
• Azara microphylla - Boxleaf Azara
• Azara petiolaris - Holly Azara
• Azara salicifolia
• Azara serrata
• Azara uruguayensis

•  
• Azolla (Aquatic ferns)
• Azorella
• Azorina
• Aztekium
• Azetura