Taxonomic List	EGF	ICRA
Abelia R. Br.	6:431	AMERICAN PUBLIC GARDENS ASSOCIATION
Abeliophyllum Nakai	5:588	AMERICAN PUBLIC GARDENS ASSOCIATION
Abies Mill.	1:88	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Abroma Jacq.	5:235	AMERICAN PUBLIC GARDENS ASSOCIATION
Abromeitiella Mez = Deuterocohnia Mez	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Abrophyllum Hook. f.	4:312	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Abrus Adans.	4:486	AMERICAN PUBLIC GARDENS ASSOCIATION
Abutilon Mill.	5:221	AMERICAN PUBLIC GARDENS ASSOCIATION
Acacia Mill.	4:466	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acalypha L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Acanthocarpus Lehm.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acanthocladium F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acanthonema Hook. f. = Streptocarpus Lindl.	-	THE GESNERIAD SOCIETY, INC.
Acanthopanax (Decne. & Planch.) Witte = Eleutherococcus Maxim.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Acanthostachys Klotzsch	2:19	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Acca O. Berg	5:306	AMERICAN PUBLIC GARDENS ASSOCIATION
Acer L.	5:132	INTERNATIONAL MAPLE SOCIETY
Achimenes Pers.	6:375	THE GESNERIAD SOCIETY, INC.
Achnophora F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acidanthera Hochst. = Gladiolus L.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Acidonia L. A. S. Johnson & B. G. Briggs	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acidosasa C. D. Chu & C. S. Chao Actinocladum McClure Ampelocalamus S. L. Chen, T. H. Wen & G. Y. Sheng Anomochloa Brongn.	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Acioa Aubl.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Acis Salisb.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Acmena DC.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acmopyle Pilg.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Acomis F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acradenia Kippist	5:105	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acridocarpus Gill. & A. Rich.	5:120	AMERICAN PUBLIC GARDENS ASSOCIATION
Acrocarpus Wight & Arn.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Acrophyllum Benth.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Acropogon Schlecht.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Acrotriche R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Actinidia Lindl.	4:26	ZHENGZHOU FRUIT RESEARCH INSTITUTE (CAAS)
Actinobole Endl.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Actinodaphne Nees	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Actinodium Schauer	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Actinostrobus Miq.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Actinotus Labill.	5:394	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Actites Lander	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Adansonia L.	5:230	AMERICAN PUBLIC GARDENS ASSOCIATION
Adenanthera L.	4:464	AMERICAN PUBLIC GARDENS ASSOCIATION
Adenanthos Labill.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Adenium Roemer & Schultes	-	XIAMEN BOTANICAL GARDEN
Adenocarpus DC.	4:549	AMERICAN PUBLIC GARDENS ASSOCIATION
Adenostoma Hook. & Arn.	4:386	AMERICAN PUBLIC GARDENS ASSOCIATION
Adesmia DC.	4:501	AMERICAN PUBLIC GARDENS ASSOCIATION
Adhatoda Mill. = Justicia L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Adriana Gaudich.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Aechmea Ruiz & Pav.	2:20	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Aechopsis D. Butcher (Aechmea Ruiz & Pav. × Canistropsis (Mez) Leme)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Aegialitis R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Aegle Corrêa	5:115	AMERICAN PUBLIC GARDENS ASSOCIATION
Aeschynanthus Jack	6:399	THE GESNERIAD SOCIETY, INC.
Aesculus L.	5:155	AMERICAN PUBLIC GARDENS ASSOCIATION
Aetheolirion Forman	-	TRADESCANTIA HUB
Aetoxicon Ruiz & Pav.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Afraegle (Swingle) Engl.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Afrocarpus (J. Buchholz & N. E. Gray) C. N. Page	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Afzelia Sm.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Agalmyla Blume	-	THE GESNERIAD SOCIETY, INC.
Agapetes D. Don ex G. Don	5:503	AMERICAN PUBLIC GARDENS ASSOCIATION
Agarista D. Don ex G. Don	5:491	AMERICAN PUBLIC GARDENS ASSOCIATION
Agastachys R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Agathaea Cass. = Felicia Cass.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Agathis Salisb.	1:72	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Agathosma Willd.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Agave L.	1:278	AMERICAN PUBLIC GARDENS ASSOCIATION
Aglaia Lour.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aglaodorum Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Aglaonema Schott	2:94	INTERNATIONAL AROID SOCIETY (I.A.S.)
Agonis (DC.) Sweet	5:317	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Agrostocrinum F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Ailanthus Desf.	5:116	AMERICAN PUBLIC GARDENS ASSOCIATION
Ajania Poljak.	6:601	AMERICAN PUBLIC GARDENS ASSOCIATION
Akania Hook. f.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Akaniaceae Stapf	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Akebia Decne.	3:397	AMERICAN PUBLIC GARDENS ASSOCIATION
Alangium Lam.	5:360	AMERICAN PUBLIC GARDENS ASSOCIATION
Alania Endl.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Albizia Durazz.	4:468	AMERICAN PUBLIC GARDENS ASSOCIATION
Albuca L.	1:219	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Alcantarea (E. Morren ex Mez) Harms	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Aldrovanda L.	4:87	INTERNATIONAL CARNIVOROUS PLANT SOCIETY (I.C.P.S.)
Alectryon Gaertn.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aleurites J. R. Forst. & G. Forst.	5:76	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Alexgeorgea Carlquist	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Alghagi Gagnebin	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Alibertia Rich.	6:91	AMERICAN PUBLIC GARDENS ASSOCIATION
Allanblackia Oliv. ex Benth. & Hook. f.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Allium L. , excluding culinary taxa	1:233	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Allocasuarina L. A. S. Johnson	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Allocheilos W. T. Wang	-	THE GESNERIAD SOCIETY, INC.
Alloplectus Mart.	-	THE GESNERIAD SOCIETY, INC.
Alloschemone Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Allostigma W. T. Wang	-	THE GESNERIAD SOCIETY, INC.
Allosyncarpia S. T. Blake	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Alloxylon P. H. Weston & Crisp	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Alluaudia Humbert & Choux	3:301	AMERICAN PUBLIC GARDENS ASSOCIATION
Alniphyllum Matsum.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Alnus Mill.	3:46	AMERICAN PUBLIC GARDENS ASSOCIATION
Alocasia (Schott) G. Don	2:101	INTERNATIONAL AROID SOCIETY (I.A.S.)
Alophia Herb.	1:360	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Aloysia Palau	6:153	AMERICAN PUBLIC GARDENS ASSOCIATION
Alrawia (Wendelbo) K. Persson & Wendelbo	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Alsobia Hanst.	6:383	THE GESNERIAD SOCIETY, INC.
Alstroemeria L.	1:208	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Altingia Noronha	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Alyogyne Alef.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Amana Honda = Tulipa L.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Amarcrinum Coutts (Amaryllis L. × Crinum L.)	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Amarine Sealy (Amaryllis L. × Nerine Herb.)	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Amarygia Cif. & Giacom. (Amaryllis L. × Brunsvigia Heist.)	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Amaryllis L.	1:300	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Amasonia L. f.	6:157	AMERICAN PUBLIC GARDENS ASSOCIATION
Amblygonocarpus Harms	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Ambrosina Bassi	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Amelanchier Medik.	4:421	AMERICAN PUBLIC GARDENS ASSOCIATION
Amelasorbus Rehder (Amelanchia Medik. × Sorbus L.)	4:422	AMERICAN PUBLIC GARDENS ASSOCIATION
Amentotaxus Pilg.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Amherstia Wall.	4:479	AMERICAN PUBLIC GARDENS ASSOCIATION
Amicia Kunth	4:500	AMERICAN PUBLIC GARDENS ASSOCIATION
Amischotolype Hassk.	-	TRADESCANTIA HUB
Ammobium R. Br. ex Sims	6:556	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Ammocharis Herb.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Ammodendron Fisch. ex DC.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Amomyrtus Kausel	5:306	AMERICAN PUBLIC GARDENS ASSOCIATION
Amoreuxia Mocino & Sesse ex DC.	5:270	AMERICAN PUBLIC GARDENS ASSOCIATION
Amorpha L.	4:500	AMERICAN PUBLIC GARDENS ASSOCIATION
Amorphophallus Blume ex Decne.	2:89	INTERNATIONAL AROID SOCIETY (I.A.S.)
Ampelopsis Michx.	5:201	AMERICAN PUBLIC GARDENS ASSOCIATION
Amperea A. Juss.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Amphibromus Nees	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Amphipogon R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Amphisiphon W. F. Barker	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Amydrium Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Amygdalus L. = Prunus L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Amyris P. Browne	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Anacardium L.	5:130	AMERICAN PUBLIC GARDENS ASSOCIATION
Anadenanthera Speg.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Anadendrum Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Anagelia E. L. Sm. (Ananas Mill. × Neoregelia L. B. Sm.)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Anagyris L.	4:532	AMERICAN PUBLIC GARDENS ASSOCIATION
Anamea anon. (Aechmea Ruiz & Pav. × Ananas Mill.)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Anamirta Colebr.	3:399	AMERICAN PUBLIC GARDENS ASSOCIATION
Ananananas D. A. Beadle (Ananas Mill. × Pseudananas (Hassl.) Harms)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Ananas Mill.	2:25	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Anaphyllopsis A. Hay	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Anaphyllum Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Anarthria R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Ancana F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Anchomanes Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Ancistrachne S. T. Blake	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Ancrumia Harv. ex Baker	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Ancylostemon Craib	-	THE GESNERIAD SOCIETY, INC.
Andersonia R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Andrachne L.	5:75	AMERICAN PUBLIC GARDENS ASSOCIATION
Androcymbium Willd.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Androlaechmea Dutrie ex C. Chev. (Aechmea Ruiz & Pav. × Androlepis Brongn. ex Houllet)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Androlepis Brongn. ex Houllet	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Andromeda L.	5:489	No ICRA at present
Androsiphon Schltr.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Aneilema R.Br.	-	TRADESCANTIA HUB
Anemone L. , bulbous species only	3:349	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Anemopaegma Mart. ex Meisn.	6:350	AMERICAN PUBLIC GARDENS ASSOCIATION
Anetanthus Hiern ex Benth. & Hook. f.	-	THE GESNERIAD SOCIETY, INC.
Angianthus J. C. Wendl.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Angophora Cav.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Angostura Roem. & Schult.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aniba Aubl.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Anigozanthos Labill.	1:290	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Anisoptera Korth.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Anna Pellegr.	-	THE GESNERIAD SOCIETY, INC.
Annona L.	3:315	AMERICAN PUBLIC GARDENS ASSOCIATION
Anodiscus Benth.	-	THE GESNERIAD SOCIETY, INC.
Anodopetalum A. Cunn. ex Endl.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Anogeissus (DC.) Guill. & Perr.	5:339	AMERICAN PUBLIC GARDENS ASSOCIATION
Anoiganthus Baker = Cyrtanthus Aiton	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Anomalesia N. E. Br. = Gladiolus L.	1:392	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Anomatheca Ker Gawl.	1:383	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Anopterus Labill.	4:318	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Anopyxis (Pierre) Pierre ex Engl.	5:183	AMERICAN PUBLIC GARDENS ASSOCIATION
Anthocercis Labill.	6:267	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Antholyza L.	-	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Anthotium R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Anthurium Schott	2:80	INTERNATIONAL AROID SOCIETY (I.A.S.)
Anthyllis L.	4:514	AMERICAN PUBLIC GARDENS ASSOCIATION
Antiaris Lesch.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Anubias Schott	2:94	INTERNATIONAL AROID SOCIETY (I.A.S.)
Aotus Sm.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Apatophyllum McGill	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Aphanamixis Blume	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aphananthe Planch.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aphanopetalum Endl.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Aphelia R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Apoclada McClure	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Apodytes E. Mey. ex Arn.	5:183	AMERICAN PUBLIC GARDENS ASSOCIATION
Apollonias Nees	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Apophyllum F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
×Aporberocereus Rowley (Aporocactus Lem. (=Disocactus Lindl.) × Weberocereus Britton & Rose) = Disberocereus E. Meier	-	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
×Aporepiphyllum Rowley (Aporocactus Lem. (=Disocactus Lindl.) × Epiphyllum Haw.) = Disophyllum Johnson	-	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Aporoberocereus Rowley	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
Aporocactus Lem. = Disocactus Lindl.	3:214	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Aporocactus Lemaire	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
×Aporochia Rowley (Aporocactus Lem. (=Disocactus Lindl.) × Nopalxochia Britton & Rose (=Disocactus Lindl.) = Disocactus Lindl.	-	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Aporodisocactus Knebel	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
×Aporodisocactus Knebel (Aporocactus Lem. (=Disocactus Lindl.) × Disocactus Lindl.) = Disocactus Lindl.	-	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
×Aporoheliocereus Knebel (Aporocactus Lem. (=Disocactus Lindl.) × Heliocereus (A. Berger) Britton & Rose (=Disocactus Lindl.)) = Disocactus Lindl.	-	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Aporophyllum Hunt	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
×Aporoselenicereus Fearn (Aporocactus Lem. (=Disocactus Lindl.) × Selenicereus (A. Berger) Britton & Rose) = Disoselenicereus E. Meier	-	EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Apuleia Mart.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aquilaria Lam.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Arabidella (F. Muell.) O. E. Schulz	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Araceae Adans. , excluding Calla L. and Zantedeschia Spreng.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Araeococcus Brongn.	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Aralia L.	5:370	AMERICAN PUBLIC GARDENS ASSOCIATION
Araucaria Juss.	1:72	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Araucariaceae Henkel & W. Hochst.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Arberella Soderstr. & C. E. Calderon Arthrostylidium Rupr.	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Arbutus L.	5:485	AMERICAN PUBLIC GARDENS ASSOCIATION
Arceuthobium M. Bieb.	3:121	AMERICAN PUBLIC GARDENS ASSOCIATION
Archeria Hook. f.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Archidendron F. Muell.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Arcterica Coville = Pieris D. Don	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Arctostaphylos Adans.	5:486	AMERICAN PUBLIC GARDENS ASSOCIATION
Arctotis L.	6:546	AMERICAN PUBLIC GARDENS ASSOCIATION
Arctous (A. Gray) Nied. = Arctostaphylos Adans.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Ardisia Sw.	5:509	AMERICAN PUBLIC GARDENS ASSOCIATION
Aregelia Kuntze (nom. illegit.) = Nidularium Lem.	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Argania Roem. & Schult.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Argyranthemum Webb	6:616	AMERICAN PUBLIC GARDENS ASSOCIATION
Argyrocytisus (Maire) Raynaud	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Argyroglottis Turcz.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Argyrolobium Eckl. & Zeyh.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aridarum Ridl.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Ariopsis Nimmo	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Arisaema Mart.	2:107	INTERNATIONAL AROID SOCIETY (I.A.S.)
Arisarum Mill.	2:107	INTERNATIONAL AROID SOCIETY (I.A.S.)
Aristolochia L.	3:417	AMERICAN PUBLIC GARDENS ASSOCIATION
Aristotelia L'Hér.	5:204	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Arnocrinum Endl. & Lehm.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Aromadendron Blume = Magnolia L.	-	no ICRA at present
Aronia Medik.	4:423	AMERICAN PUBLIC GARDENS ASSOCIATION
Arophyton Jum.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Artabotrys R. Br.	3:316	AMERICAN PUBLIC GARDENS ASSOCIATION
Artemisia L. , shrubby cultivars	6:601	AMERICAN PUBLIC GARDENS ASSOCIATION
Arthropodium R. Br.	1:132	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Arthrostylis R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Artocarpus J. R. Forst. & G. Forst.	3:87	AMERICAN PUBLIC GARDENS ASSOCIATION
Arum L.	2:104	INTERNATIONAL AROID SOCIETY (I.A.S.)
Arundinaria Michaux	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Ascyrum L. = Hypericum L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Asimina Adans.	3:316	AMERICAN PUBLIC GARDENS ASSOCIATION
Aspidistra Ker Gawl.	1:250	AMERICAN PUBLIC GARDENS ASSOCIATION
Astartea DC.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Asteranthera Hanst.	6:393	THE GESNERIAD SOCIETY, INC.
Asterolasia F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Asteromyrtus Schauer	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Asterostigma Fisch. & C. A. Mey.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Astilbe Buch.-Ham. ex D. Don	4:245	LAKELAND HORTICULTURAL SOCIETY
Astiria Lindl	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Astrebla F. Muell. ex Benth.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Astroloba Uitew.	-	HAWORTHIA SOCIETY OF JAPAN
Astroloma R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Astrotricha DC.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Atalantia Corrêa	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Atalaya Blume	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Atherosperma Labill.	3:319	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Athertonia L. A. S. Johnson & B. G. Briggs	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Athrixia Ker Gawl.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Athroostachys Benth.	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Athrotaxis D. Don	1:78	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Atkinsonia F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Atractantha McClure	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Atragene L. = Clematis L.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CLEMATIS
Atraphaxis L.	3:124	AMERICAN PUBLIC GARDENS ASSOCIATION
Atriplex L.	3:197	AMERICAN PUBLIC GARDENS ASSOCIATION
Atuna Raf.	4:463	AMERICAN PUBLIC GARDENS ASSOCIATION
Aucoumea Pierre	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Aucuba Thunb.	5:366	AMERICAN PUBLIC GARDENS ASSOCIATION
Aulax P. J. Bergius	3:109	PROTEACEAE CULTIVAR REGISTRATION AUTHORITY, NATIONAL DEPARTMENT OF AGRICULTURE (SOUTH AFRICA)
Aulonemia Goudot	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Austrobaileya C. T. White	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Austrobaileyaceae Croizat	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Austrocedrus Florin & Boutelje	1:79	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Austrodolichos Verdc.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Austromatthaea L. S. Sm.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Austromuellera C. T. White	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Austrotaxus Compton	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Ayensua L. B. Sm.	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Azadirachta A. Juss.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Azalea L. = Rhododendron L.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - RHODODENDRON
Azara Ruiz & Pav.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Azorina Feer	6:476	AMERICAN PUBLIC GARDENS ASSOCIATION

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