Last updated October 1, 2009
| NAME | FAMILY | NATIVITY |
| Abelia x grandiflora cv. Edward Goucher | Caprifoliaceae | |
| Abrophyllum ornans | Grossulariaceae | Australia(Queensland, NSW) |
| Abutilon sp. | Malvaceae | |
| Abutilon x hybridum cv. Nabob | Malvaceae | |
| Acacia binervia | Mimosaceae | E Australia |
| Acacia elata | Mimosaceae | SE Australia |
| Acacia melanoxylon | Mimosaceae | Australia |
| Acacia pendula | Mimosaceae | Australia |
| Acacia sieberana v. woodii | Mimosaceae | South Africa |
| Acacia spectabilis | Mimosaceae | Australia |
| Acacia stenophylla | Mimosaceae | Australia |
| Acacia subporosa | Mimosaceae | Australia |
| Acacia verticillata ssp. verticillata | Mimosaceae | SE Australia |
| Acalypha pendula | Euphorbiaceae | Cuba |
| Acalypha sp. | Euphorbiaceae | |
| Acanthocalycium spiniflorum | Cactaceae | Argentina(Cordoba) |
| Acanthocereus colombianus | Cactaceae | Colombia |
| Acanthocereus horridus | Cactaceae | SE Mex, Guatemala, El Salvador |
| Acanthocereus sp. | Cactaceae | |
| Acanthostachys pitcairnioides | Bromeliaceae | Brazil(Espirito Santo) |
| Acanthostachys strobilacea | Bromeliaceae | South America |
| Acanthus mollis | Acanthaceae | S Europe |
| Acer negundo cv. Flamingo | Aceraceae | |
| Acer palmatum | Aceraceae | Asia |
| Acer palmatum cv. Dissectum | Aceraceae | |
| Acer palmatum cv. Dissectum Atropurpureum | Aceraceae | |
| Acer palmatum cv. Glowing Embers | Aceraceae | |
| Acer palmatum cv. Seiryu | Aceraceae | |
| Acer palmatum cv. Tobiosho | Aceraceae | |
| Achillea cv. Moonshine | Asteraceae | |
| Achillea filipendulina cv. Cloth of Gold | Asteraceae | |
| Achillea millefolium cv. Cerise Queen | Asteraceae | |
| Achillea millefolium cv. Lavender Beauty | Asteraceae | |
| Achillea millefolium cv. Paprika | Asteraceae | |
| Achillea sp. | Asteraceae | |
| Acnistus arborescens | Solanaceae | Tropical America |
| Acoelorrhaphe wrightii | Arecaceae | Fla. to Cen America, W. Indies |
| Acorus calamus cv. Variegatus | Acoraceae | |
| Acrocomia aculeata | Arecaceae | NE Argentina, Paraguay |
| Adenanthos cuneatus cv. Coral Drift | Proteaceae | Australia |
| Adenanthos sericeus | Proteaceae | Australia |
| Adenia epigea | Passifloraceae | Madagascar |
| Adenia globosa | Passifloraceae | Africa |
| Adenia venenata | Passifloraceae | Ethiopia to E Africa |
| Adenium arabicum | Apocynaceae | Arabia |
| Adenium arabicum | Apocynaceae | Saudi Arabia |
| Adenium cv. Chompoo Sam Ran | Apocynaceae | |
| Adenium swazicum | Apocynaceae | African Tropics |
| Adiantum aleuticum | Adiantaceae | Canada to W United States |
| Adiantum formosum | Pteridaceae | Australia and NZ |
| Adiantum hispidulum | Adiantaceae | Old World Tropics |
| Adiantum raddianum | Adiantaceae | |
| Adiantum raddianum cv. Fragrantissimum | Adiantaceae | |
| Adiantum raddianum cv. Pacottii | Adiantaceae | |
| Adromischus cf. cristatus | Crassulaceae | South Africa |
| Adromischus cristatus | Crassulaceae | South Africa |
| Aechmea blanchetiana | Bromeliaceae | Brazil |
| Aechmea bracteata | Bromeliaceae | Mexico to Colombia |
| Aechmea bromeliifolia | Bromeliaceae | Cen America to South America |
| Aechmea bromeliifolia v. rubra | Bromeliaceae | Argentina to S Brazil |
| Aechmea calyculata | Bromeliaceae | S Brazil |
| Aechmea caudata | Bromeliaceae | S Brazil |
| Aechmea coelestis | Bromeliaceae | Brazil |
| Aechmea comata | Bromeliaceae | |
| Aechmea comata v. makoyana | Bromeliaceae | Brazil |
| Aechmea cv. Belizia | Bromeliaceae | |
| Aechmea cv. Big Stuff | Bromeliaceae | |
| Aechmea cv. Black Panther | Bromeliaceae | |
| Aechmea cv. Burgundy | Bromeliaceae | |
| Aechmea cv. Mirlo | Bromeliaceae | |
| Aechmea cylindrata | Bromeliaceae | S Brazil |
| Aechmea distichantha | Bromeliaceae | Brazil |
| Aechmea fasciata | Bromeliaceae | Brazil |
| Aechmea fasciata v. purpurea | Bromeliaceae | Brazil |
| Aechmea fendleri hybrid | Bromeliaceae | |
| Aechmea flavo-rosea | Bromeliaceae | Brazil(Rio de Janeiro) |
| Aechmea luddemanniana | Bromeliaceae | Mexico, Cen America |
| Aechmea nudicaulis | Bromeliaceae | Brazil |
| Aechmea nudicaulis v. albomarginata | Bromeliaceae | |
| Aechmea orlandiana | Bromeliaceae | Brazil |
| Aechmea orlandiana x fosteriana cv. Bert | Bromeliaceae | |
| Aechmea ornata | Bromeliaceae | Brazil |
| Aechmea ornata v. nationalis | Bromeliaceae | Brazil |
| Aechmea pectinata | Bromeliaceae | Brazil |
| Aechmea phanerophlebia | Bromeliaceae | S Brazil |
| Aechmea pineliana | Bromeliaceae | Brazil |
| Aechmea pineliana v. minuta | Bromeliaceae | Brazil |
| Aechmea racinae | Bromeliaceae | Brazil |
| Aechmea ramosa | Bromeliaceae | Brazil |
| Aechmea ramosa v. festiva | Bromeliaceae | E Brazil |
| Aechmea recurvata cv. Aztec Gold | Bromeliaceae | |
| Aechmea recurvata v. benrathii | Bromeliaceae | Brazil |
| Aechmea recurvata v. ortgiesii | Bromeliaceae | Brazil |
| Aechmea recurvata v. recurvata | Bromeliaceae | Brazil |
| Aechmea recurvata x comata | Bromeliaceae | Brazil |
| Aechmea sp. | Bromeliaceae | |
| Aechmea triangularis | Bromeliaceae | Brazil |
| Aechmea weilbachii f. leodiensis | Bromeliaceae | Brazil |
| Aeonium arboreum cv. Sunburst | Crassulaceae | |
| Aeonium arboreum cv. Zwartkop | Crassulaceae | |
| Aeonium arboreum v. holochrysum | Crassulaceae | Spain(Canary Islands) |
| Aeonium canariensis | Crassulaceae | Spain |
| Aeonium castello-paivae | Crassulaceae | Spain(Canary Islands) |
| Aeonium cuneatum | Crassulaceae | Spain(Canary Islands) |
| Aeonium cv. Cyclops | Crassulaceae | |
| Aeonium lindleyi | Crassulaceae | Spain(Canary Islands) |
| Aeonium nobile | Crassulaceae | Spain(Canary Islands) |
| Aeonium sedifolium | Crassulaceae | Spain(Canary Islands) |
| Aeonium simsii | Crassulaceae | Spain(Canary Islands) |
| Aeonium simsii x Zwartkopf | Crassulaceae | |
| Aeonium sp. | Crassulaceae | |
| Aeonium spathulatum | Crassulaceae | Spain(Canary Islands) |
| Aeonium undulatum | Crassulaceae | Spain(Canary Islands) |
| Aeonium urbicum | Crassulaceae | Spain(Canary Islands) |
| Aeonium virgineum | Crassulaceae | Spain(Canary Islands) |
| Afrocarpus gracilior | Podocarpaceae | E & S Africa |
| Afrocarpus henkelii | Podocarpaceae | Africa |
| Agapanthus orientalis | Alliaceae | Africa |
| Agathis robusta | Araucariaceae | NE Australia |
| Agave americana | Agavaceae | E Mexico |
| Agave americana cv. Marginata | Agavaceae | |
| Agave americana cv. Medio-picta | Agavaceae | |
| Agave americana cv. Medio-picta alba | Agavaceae | |
| Agave americana cv. Striata | Agavaceae | |
| Agave atrovirens | Agavaceae | Mexico(Oaxaca) |
| Agave attenuata | Agavaceae | Mexico |
| Agave attenuata cv. Boutin Blue | Agavaceae | |
| Agave attenuata v. variegata | Agavaceae | |
| Agave bracteosa | Agavaceae | NE Mexico |
| Agave celsii | Agavaceae | Mexico(Nuevo Leon) |
| Agave colimana | Agavaceae | Mexico(Colima, Jalisco) |
| Agave colorata | Agavaceae | Mexico(Sonora) |
| Agave cupreata | Agavaceae | Mexico(Guerrero, Michoacán) |
| Agave cv. Blue Flame | Agavaceae | |
| Agave cv. Mr. Ripple | Agavaceae | Mexico |
| Agave dasylirioides | Agavaceae | Mexico |
| Agave desmetiana v. aureomarginata | Agavaceae | Mexico |
| Agave ferox | Agavaceae | |
| Agave filifera | Agavaceae | E Mexico |
| Agave filifera cv. Compacta | Agavaceae | |
| Agave franzosinii | Agavaceae | Mexico |
| Agave gentryi cv. Jaws | Agavaceae | |
| Agave gigantensis | Agavaceae | Baja California |
| Agave guiengola | Agavaceae | Mexico(Oaxaca) |
| Agave gypsophila | Agavaceae | Mexico(Guerrero) |
| Agave horrida | Agavaceae | Mexico(Morelos) |
| Agave isthmensis | Agavaceae | S Mexico |
| Agave karatto | Agavaceae | West Indies |
| Agave lophantha | Agavaceae | Texas to Mexico(Tamaulipas) |
| Agave macroacantha | Agavaceae | Mexico |
| Agave maximiliana v. katharinae | Agavaceae | Mexico |
| Agave montana | Agavaceae | NE Mexico |
| Agave multifilifera | Agavaceae | Mexico(Sonora) |
| Agave murpheyi | Agavaceae | Cen Arizona to Mexico(Sonora) |
| Agave murpheyi cv. Engard | Agavaceae | |
| Agave nizandensis | Agavaceae | Mexico(Oaxaca) |
| Agave ocahui | Agavaceae | Mexico(Sonora) |
| Agave ornithobroma | Agavaceae | Mexico(Sinaloa) |
| Agave pachycentra | Agavaceae | Mexico to El Salvador |
| Agave parryi | Agavaceae | N Arizona to Mexico |
| Agave parryi v. huachucensis | Agavaceae | US(Arizona), Mexico(Sonora) |
| Agave parryi v. truncata | Agavaceae | Mexico(Durango, Zacatecas) |
| Agave pendula | Agavaceae | Mexico |
| Agave potatorum | Agavaceae | Mexico |
| Agave pumila | Agavaceae | Mexico |
| Agave pygmae | Agavaceae | Mexico(Chiapas) |
| Agave schottii | Agavaceae | SW U.S. to Mexico |
| Agave sisalana cv. Variegata | Agavaceae | |
| Agave sisalana v. armata | Agavaceae | Mexico |
| Agave sobria | Agavaceae | Baja California |
| Agave sp. | Agavaceae | |
| Agave stricta | Agavaceae | Mexico |
| Agave tenuifolia | Agavaceae | Mexico |
| Agave tequilana cv. Variegata | Agavaceae | |
| Agave titanota | Agavaceae | Mexico |
| Agave toumeyana ssp. toumeyana | Agavaceae | SW United States |
| Agave victoriae-reginae | Agavaceae | Mexico |
| Agave vilmoriniana | Agavaceae | Mexico |
| Agave wendtii | Agavaceae | Mexico |
| Agave xylonacantha | Agavaceae | Mexico |
| Aglaomorpha heraclea | Polypodiaceae | Sumatra to New Guinea |
| Aglaonaria robertsii cv. Santa Rosa | Polypodiaceae | |
| Agonis flexuosa | Myrtaceae | W Australia |
| Ajuga cv. Black Scallop | Lamiaceae | |
| Akebia quinata | Lardizabalaceae | China, Korea, Japan |
| Albizia sp. | Mimosaceae | |
| Albuca batteniana | Hyacinthaceae | South Africa |
| Albuca canadensis | Hyacinthaceae | South Africa |
| Alcantarea imperialis | Bromeliaceae | Brazil |
| Alcea rosea | Malvaceae | |
| Alectryon coriaceus | Sapindaceae | Australia |
| Allium unifolium | Amaryllidaceae | United States |
| Allocasuarina torulosa | Casuarinaceae | E Australia |
| Alluaudia dumosa | Didiereaceae | Madagascar |
| Alluaudia humbertii | Didiereaceae | Magadascar |
| Alluaudia procera | Didiereaceae | Madagascar |
| Alluaudia procera | Didiereaceae | S & SW Madagascar |
| Alluaudia sp. | Didiereaceae | Madagascar |
| Alocasia odora | Araceae | Asia |
| Aloe aculeata | Asphodelaceae | S. Africa(N.Prov.), Zimbabwe |
| Aloe aculeata | Asphodelaceae | Zimbabwe |
| Aloe acutissima | Asphodelaceae | Cen Madagascar |
| Aloe affinis | Asphodelaceae | South Africa |
| Aloe africana | Asphodelaceae | South Africa |
| Aloe africana | Asphodelaceae | South Africa(E. Cape Province) |
| Aloe alooides | Asphodelaceae | South Africa |
| Aloe ammophila | Asphodelaceae | South Africa |
| Aloe amudatensis | Asphodelaceae | Uganda |
| Aloe angelica | Asphodelaceae | South Africa |
| Aloe arborescens | Asphodelaceae | South Africa |
| Aloe arborescens (variegated) | Asphodelaceae | |
| Aloe arborescens x ferox | Asphodelaceae | |
| Aloe arborescens x wickensii | Asphodelaceae | |
| Aloe arenicola | Asphodelaceae | South Africa |
| Aloe aristata | Asphodelaceae | South Africa |
| Aloe barbadensis | Asphodelaceae | Saudi Arabia |
| Aloe barberae | Asphodelaceae | Mozambique |
| Aloe barberae | Asphodelaceae | S. Africa, Mozambique, Swaz. |
| Aloe barberae | Asphodelaceae | S. Africa, Mozambizue, Swaz. |
| Aloe barberae x dichotoma | Asphodelaceae | |
| Aloe betsileensis | Asphodelaceae | Madagascar |
| Aloe branddraaiensis | Asphodelaceae | South Africa(Mpumalanga) |
| Aloe brevifolia | Asphodelaceae | South Africa(W. Cape Province) |
| Aloe broomii | Asphodelaceae | South Africa |
| Aloe buhrii | Asphodelaceae | South Africa(N. Cape Province) |
| Aloe bulbillifera | Asphodelaceae | Madagascar |
| Aloe burgersfortensis | Asphodelaceae | South Africa(Mpumalanga) |
| Aloe calcairophila | Asphodelaceae | Madagascar |
| Aloe cameronii | Asphodelaceae | South Africa |
| Aloe cameronii x arborescens | Asphodelaceae | |
| Aloe camperi | Asphodelaceae | Ethiopia |
| Aloe candelabrum | Asphodelaceae | South Africa(KwaZulu-Natal) |
| Aloe capitata v. capitata | Asphodelaceae | Cen Madagascar |
| Aloe capitata v. cipolinicola | Asphodelaceae | Cen Madagascar |
| Aloe castanea | Asphodelaceae | South Africa(Northern Prov.) |
| Aloe chabaudii | Asphodelaceae | South Africa |
| Aloe chabaudii v. verekeri | Asphodelaceae | South Africa |
| Aloe ciliaris | Asphodelaceae | South Africa(E. Cape Province) |
| Aloe classenii | Asphodelaceae | Kenya |
| Aloe compressa v. rugosquamosa | Asphodelaceae | Cen Madagascar |
| Aloe comptonii | Asphodelaceae | South Africa |
| Aloe confusa | Asphodelaceae | Tanzania |
| Aloe congolense | Asphodelaceae | Kenya |
| Aloe conifera | Asphodelaceae | Cen Madagascar |
| Aloe cryptopoda | Asphodelaceae | South Africa(Northern Prov.) |
| Aloe cv. Lizard Lips | Asphodelaceae | |
| Aloe cv. Olympic Star | Asphodelaceae | |
| Aloe cv. Pink Perfection | Asphodelaceae | |
| Aloe cv. Quicksilver | Asphodelaceae | |
| Aloe cv. Rooikappie | Asphodelaceae | |
| Aloe cv. Sparkling Burgundy | Asphodelaceae | |
| Aloe cyrtophylla | Asphodelaceae | Madagascar |
| Aloe davyana | Asphodelaceae | South Africa |
| Aloe dawei | Asphodelaceae | Uganda |
| Aloe decaryi | Asphodelaceae | Madagascar |
| Aloe deltoideodonta | Asphodelaceae | Madagascar |
| Aloe deltoideodonta v. nova | Asphodelaceae | Madagascar |
| Aloe descoingsii | Asphodelaceae | |
| Aloe descoingsii | Asphodelaceae | Madagascar |
| Aloe dichotoma | Asphodelaceae | South Africa |
| Aloe dichotoma | Asphodelaceae | South Africa(N. Cape Province) |
| Aloe diolii | Asphodelaceae | Sudan |
| Aloe distans | Asphodelaceae | South Africa(W. Cape Province) |
| Aloe divaricata | Asphodelaceae | Madagascar |
| Aloe dolomitica | Asphodelaceae | South Africa(Northern Prov.) |
| Aloe dorotheae | Asphodelaceae | Tanzania |
| Aloe dumetorum | Asphodelaceae | Kenya |
| Aloe elgonica | Asphodelaceae | Kenya |
| Aloe excelsa | Asphodelaceae | Africa |
| Aloe excelsa | Asphodelaceae | SW Africa |
| Aloe ferox | Asphodelaceae | |
| Aloe ferox | Asphodelaceae | South Africa |
| Aloe ferox x arborescens | Asphodelaceae | |
| Aloe fievettii | Asphodelaceae | Madagascar |
| Aloe flexilifolia | Asphodelaceae | Tanzania |
| Aloe forbesii | Asphodelaceae | Yemen(Socotra) |
| Aloe fragilis | Asphodelaceae | Madagascar |
| Aloe framesii | Asphodelaceae | South Africa |
| Aloe gerstneri | Asphodelaceae | South Africa(KwaZulu-Natal) |
| Aloe globuligemma | Asphodelaceae | South Africa, Zimbabwe |
| Aloe gracilis | Asphodelaceae | South Africa(E. Cape Province) |
| Aloe grandidentata | Asphodelaceae | South Africa |
| Aloe greenii | Asphodelaceae | South Africa(KwaZulu-Natal) |
| Aloe haggeherensis | Asphodelaceae | Yemen |
| Aloe harlana | Asphodelaceae | Ethiopia |
| Aloe hemmingii | Asphodelaceae | Somalia |
| Aloe humilis | Asphodelaceae | South Africa |
| Aloe hybrid | Asphodelaceae | |
| Aloe ibitiensis | Asphodelaceae | Cen Madagascar |
| Aloe intermedia | Asphodelaceae | |
| Aloe jacksonii | Asphodelaceae | Ethiopia |
| Aloe jucunda | Asphodelaceae | Somalia |
| Aloe juvenna | Asphodelaceae | Kenya |
| Aloe karasbergensis | Asphodelaceae | South Africa |
| Aloe kedongensis | Asphodelaceae | South Africa |
| Aloe lineata | Asphodelaceae | South Africa |
| Aloe lutescens | Asphodelaceae | South Africa(Northern Prov.) |
| Aloe macrocarpa | Asphodelaceae | South Africa |
| Aloe macroclada | Asphodelaceae | Cen Madagascar |
| Aloe madecassa | Asphodelaceae | Cen Madagascar |
| Aloe marlothii | Asphodelaceae | South Africa |
| Aloe marlothii | Asphodelaceae | SW Africa |
| Aloe marlothii hybrid | Asphodelaceae | |
| Aloe mawii | Asphodelaceae | Malawi |
| Aloe mcloughlinii v. | Asphodelaceae | Ethiopia |
| Aloe melanacantha | Asphodelaceae | S Namibia to South Africa |
| Aloe microstigma | Asphodelaceae | South Africa |
| Aloe mitriformis | Asphodelaceae | South Africa(W. Cape Province) |
| Aloe mubendiensis | Asphodelaceae | Uganda |
| Aloe mudenensis | Asphodelaceae | South Africa(KwaZulu-Natal) |
| Aloe mutabilis | Asphodelaceae | South Africa |
| Aloe ngobitensis | Asphodelaceae | Kenya |
| Aloe officinalis | Asphodelaceae | Saudi Arabia |
| Aloe ortholopha | Asphodelaceae | Zimbabwe |
| Aloe parvibracteata | Asphodelaceae | South Africa |
| Aloe parvula | Asphodelaceae | Madagascar |
| Aloe pearsonii | Asphodelaceae | S. Africa(N. Cape Province) |
| Aloe peckii | Asphodelaceae | Somalia |
| Aloe petricola | Asphodelaceae | South Africa(Mpumalanga) |
| Aloe plicatilis | Asphodelaceae | South Africa(W. Cape Province) |
| Aloe pluridens | Asphodelaceae | South Africa |
| Aloe polyphylla | Asphodelaceae | Lesotho |
| Aloe porphyrostachys | Asphodelaceae | Saudi Arabia |
| Aloe powysiorum | Asphodelaceae | Kenya |
| Aloe pretoriensis | Asphodelaceae | S Zimbabwe to South Africa |
| Aloe prinslooi | Asphodelaceae | South Africa(KwaZulu-Natal) |
| Aloe ramosissima | Asphodelaceae | Namibia,South Africa(N. Cape) |
| Aloe ramosissima | Asphodelaceae | South Africa |
| Aloe rauhii | Asphodelaceae | Madagascar |
| Aloe reitzii | Asphodelaceae | South Africa |
| Aloe rubroviolacea | Asphodelaceae | Arabia |
| Aloe rupestris | Asphodelaceae | S Mozambique, S. Africa |
| Aloe rupestris | Asphodelaceae | Swaziland |
| Aloe sabaea | Asphodelaceae | Saudi Arabia |
| Aloe saponaria | Asphodelaceae | South Africa |
| Aloe schomeri | Asphodelaceae | Madagascar |
| Aloe scobinifolia | Asphodelaceae | Somalia |
| Aloe scorpioides | Asphodelaceae | Angola |
| Aloe secundiflora | Asphodelaceae | E Africa to Sudan |
| Aloe sessiliflora | Asphodelaceae | South Africa |
| Aloe sinkatana | Asphodelaceae | Sudan |
| Aloe somaliensis | Asphodelaceae | Somalia |
| Aloe somaliensis v. marmorata | Asphodelaceae | Somalia |
| Aloe sp. | Asphodelaceae | |
| Aloe sp. nov. | Asphodelaceae | |
| Aloe speciosa | Asphodelaceae | South Africa |
| Aloe spectabilis | Asphodelaceae | South Africa |
| Aloe spinosissima | Asphodelaceae | South Africa |
| Aloe squarrosa | Asphodelaceae | Yemen(Socotra) |
| Aloe striata | Asphodelaceae | SW Africa |
| Aloe striata ssp. cv. karasbergensis | Asphodelaceae | South Africa, S Namibia |
| Aloe striatula | Asphodelaceae | S. Africa(E. Cape Prov.) |
| Aloe succotrina | Asphodelaceae | South Africa(W. Cape Province) |
| Aloe suprafoliata | Asphodelaceae | Swaziland, South Africa |
| Aloe suzannae | Asphodelaceae | Madagascar |
| Aloe swynnertonii | Asphodelaceae | Zimbabwe |
| Aloe swynnertonii | Asphodelaceae | Zimbabwe, Mozambique |
| Aloe tenuior | Asphodelaceae | South Africa |
| Aloe thraskii | Asphodelaceae | South Africa |
| Aloe tomentosa | Asphodelaceae | Saudi Arabia, Yemen, Somalia |
| Aloe tororoana | Asphodelaceae | Uganda |
| Aloe vanbalenii | Asphodelaceae | South Africa |
| Aloe vaombe | Asphodelaceae | South and Southwest Madagascar |
| Aloe vaotsanda | Asphodelaceae | Madagascar |
| Aloe viguieri | Asphodelaceae | SW Madagascar |
| Aloe virens | Asphodelaceae | South Africa |
| Aloe wickensii | Asphodelaceae | South Africa |
| Aloe x calcairophila | Asphodelaceae | |
| Aloe x principis | Asphodelaceae | South Africa |
| Aloe yavellana | Asphodelaceae | Ethiopia |
| Aloe zebrina | Asphodelaceae | SW Africa |
| Alpinia pricei | Zingiberaceae | Taiwan |
| Alpinia speciosa | Zingiberaceae | SE Asia |
| Alpinia zerumbet cv. Variegata | Zingiberaceae | |
| Alstroemeria cv. Tall Pink | Alstroemeriaceae | |
| Alyogyne huegelii | Malvaceae | Australia |
| Alyogyne huegelii cv. Santa Cruz | Malvaceae | Australia |
| Amaryllis belladonna | Amaryllidaceae | South Africa |
| Amorphophallus konjac | Araceae | S. China |
| Anacampseros telephiastrum | Portulacaceae | South Africa |
| Anagallis arvensis | Primulaceae | |
| Ananas bracteatus v. striatus | Bromeliaceae | Brazil |
| Anemia phyllitidis | Schizaeaceae | Tropical America |
| Angophora costata | Myrtaceae | Australia |
| Angraecum suberbum | Orchidaceae | Madagascar |
| Anigozanthos cv. Bush Tango | Haemodoraceae | |
| Anigozanthos flavidus | Haemodoraceae | W Australia |
| Anigozanthos flavidus cv. Pink | Haemodoraceae | |
| Anthurium berriozabalense | Araceae | S Mexico |
| Anthurium cf. podophyllum | Araceae | Mexico |
| Anthurium hookeri | Araceae | Guyana, West Indies |
| Anthurium podophyllum | Araceae | Mexico |
| Anthurium polyphytum | Araceae | |
| Anthurium scandens | Araceae | Mexico, C & S Amer, W. Indies |
| Anthurium sp. | Araceae | |
| Anthurium spectabile | Araceae | Costa Rica |
| Anthurium x podophyllum | Araceae | |
| Aponogeton distachyus | Aponogetonaceae | South Africa |
| Aporocactus flagelliformis | Cactaceae | Mexico |
| Aptenia cordifolia | Aizoaceae | South Africa |
| Arachniodes davalliformis | Dryopteridaceae | |
| Arachniodes standishii | Dryopteridaceae | Japan, Korea |
| Araucaria araucana | Araucariaceae | Chile |
| Araucaria bidwillii | Araucariaceae | Australia |
| Araucaria cunninghamii | Araucariaceae | E Australia |
| Araucaria heterophylla | Araucariaceae | Australia(Norfolk Is.) |
| Araucaria rulei | Araucariaceae | New Caledonia |
| Archontophoenix alexandrae | Arecaceae | Australia(Queensland) |
| Archontophoenix cunninghamiana | Arecaceae | SE Australia |
| Archontophoenix sp. nov. | Arecaceae | E Australia |
| Arctostaphylos cv. Howard McMinn | Ericaceae | |
| Arctostaphylos densiflora cv. Howard McMinn | ericacaea | California |
| Arctotis acaulis cv. Big Magenta | Asteraceae | South Africa |
| Arenga engleri | Arecaceae | Taiwan, Japan(Ryukyu Is.) |
| Arenga pinnata | Arecaceae | |
| Arenga pinnata | Arecaceae | Tropical Asia |
| Arequipa hazalae | Cactaceae | Peru |
| Aristea ecklonii | Iridaceae | Africa |
| Aristolochia elegans | Aristolochiaceae | Brazil |
| Aristolochia fimbriata | Aristolochiaceae | Argentina, Paraguay, Brazil |
| Aristolochia gigantea | Aristolochiaceae | Brazil |
| Armatocereus cartwrightianus | Cactaceae | S Ecuador, N Peru |
| Armatocereus churinensis | Cactaceae | Peru |
| Armatocereus godingianus | Cactaceae | Ecuador |
| Armatocereus mataranus | Cactaceae | Ecuador, Peru |
| Armatocereus matucanensis | Cactaceae | Ecuador, Peru |
| Armatocereus sp. | Cactaceae | |
| Armeria maritima | Plumbaginaceae | Worldwide |
| Artemisia ludoviciana cv. Silver King | Asteraceae | |
| Artemisia stellerana | Asteraceae | |
| Arthropteris monocarpa | Oleandraceae | Tropical Africa |
| Arthropteris tenella | Oleandraceae | Australia, New Zealand |
| Asclepias cancellata | Asclepiadaceae | South Africa |
| Asclepias curassavica | Asclepiadacaea | |
| Asclepias curassavica cv. Silky Scarlet | Asclepiadaceae | |
| Asclepias fascicularis | Asclepiadacaea | W. North America |
| Asclepias fascicularis | Asclepiadaceae | NW U.S. |
| Asclepias incarnata cv. Soulmate | Asclepiadaceae | |
| Asclepias speciosa | Asclepiadaceae | W North America |
| Asclepias tuberosa | Asclepiadaceae | Eastern United States |
| Asclepias tuberosa cv. Gay Butterflies | Asclepiadaceae | |
| Aspidistra elatior | Convallariaceae | Japan |
| Aspidistra elatior cv. Variegata | Convallariaceae | |
| Aspidistra sp. | Convallariaceae | |
| Asplenium antiguum | Polypodiaceae | S Japan |
| Asplenium bulbiferum | Polypodiaceae | SE Australia |
| Asplenium daucifolium | Polypodiaceae | Mauritius, Madagascar |
| Asplenium goudeyi | Aspleniaceae | Australia |
| Asplenium nidus | Polypodiaceae | Asian Tropics, Polynesia |
| Asplenium nidus cv. Lazana | Polypodiaceae | |
| Asplenium oblongifolium | Aspleniaceae | New Zealand |
| Asplenium surrogatum | Aspleniaceae | Lord Howe Island |
| Asplenium surrogatum | Polypodiaceae | Australia (Lord Howe Is.) |
| Astelia chathamica cv. Silver Spear | Asteliaceae | |
| Aster sp. | Asteraceae | |
| Asteriscus maritimas cv. Gold Coin | Asteraceae | |
| Astroloba deltoidea | Asphodelaceae | South Africa |
| Astrophytum asterias | Cactaceae | Texas, Mexico |
| Astrophytum cv. Lotusland | Cactaceae | |
| Astrophytum myriostigma | Cactaceae | Mexico |
| Astrophytum ornatum | Cactaceae | Cen Mexico |
| Athyrium felix-femina cv. Victoria | Dryopteridaceae | Boreal |
| Athyrium filix-femina cv. Cristata | Dryopteridaceae | |
| Athyrium nipponicum cv. Pictum | Dryopteridaceae | China and Japan |
| Atriplex canescens | Chenopodiacea | North America |
| Atriplex canescens | Chenopodiaceae | USA |
| Atriplex lentiformis | Chenopodiaceae | SW United States, N Mexico |
| Atriplex lentiformis | Chenopodiaceae | Western US |
| Atriplex lentiformis ssp. breweri | Chenopodiaceae | SW United States to NW Mexico |
| Aucuba japonica | Cornaceae | Himalayas to Japan |
| Aucuba japonica cv. Variegata | Cornaceae | |
| Austrocylindropuntia subulata | Cactaceae | Peru, Bolivia, Argentina |
| Austrocylindropuntia vestita | Cactaceae | Bolivia, N Argentina |
| Azara integrifolia | Flacourtiaceae | Chile |
| Azara sp. | Flacourtiaceae | |
| Azorina vidalii | Campanulaceae | Portugal |
