BGCI European Threatened Taxon starting with A
| Number of
accessions |
| Achillea ambrosiaca Boiss. | 2 |
| Acinos troodi (Post) Leblebici | 2 |
| Aconitum napellus L. subsp. corsicum (Gáyer) W. Seitz | 2 |
| Adenocarpus gibbsianus S.Castroviejo & Talavera | 3 |
| Aethionema retsina Phitos & Snogerup | 2 |
| Agrostis barceloi L.Sáez & Rosselló | 2 |
| Alchemilla fontqueri Rothm. | 1 |
| Allium autumnale P.H.Davis | 3 |
| Allium chrysonemum Stearn | 1 |
| Allium grosii Font Quer | 2 |
| Allium heldreichii Boiss. | 3 |
| Allium insubricum Boiss. & Reut. | 9 |
| Allium narcissiflorum Vill. | 1 |
| Allium parnassicum (Boiss.) Halácsy | 1 |
| Allium rouyi Gaut. | 2 |
| Allium willeanum Holmboe | 9 |
| Alyssum akamasicum B.L.Burtt | 11 |
| Alyssum fallacinum Hausskn. | 4 |
| Alyssum fragillimum (Baldacci) Rech.f. | 4 |
| Alyssum loiseleurii P.Fourn. | 2 |
| Alyssum nebrodense Tineo | 2 |
| Alyssum robertianum Bernard & al. | 1 |
| Alyssum sphacioticum Boiss. & Heldr. | 7 |
| Anacyclus alboranensis Esteve & Varo | 2 |
| Anchusa caespitosa Lam. | 5 |
| Anchusa crispa Viv. | 3 |
| Androcymbium europaeum (Lange) K.Richt. | 10 |
| Androcymbium rechingeri Greuter | 15 |
| Androsace brevis (Hegetschw.) Cesati | 2 |
| Androsace rioxana A.Segura | 1 |
| Androsace vitaliana (L.) Lapeyr. subsp. assoana (M.Laínz) Kress | 3 |
| Andryala agardhii Haensel. ex DC. | 6 |
| Anthemis aetnensis Schouw | 2 |
| Anthemis bourgaei Boiss. & Reut. | 5 |
| Anthemis glaberrima (Rech.f.) Greuter | 12 |
| Anthemis sibthorpii | 1 |
| Anthyllis tejedensis Boiss. subsp. plumosa (Cullen ex E.Domínguez) C.Benedí González | 2 |
| Anthyllis vulneraria L. subsp. busambarensis (Lojac.) Pignatti | 1 |
| Antirrhinum subbaeticum J.Güemes, I.Mateu & P.Sánchez-Gómez | 6 |
| Aquilegia barbaricina Arrigoni & E.Nardi | 4 |
| Aquilegia nugorensis Arrigoni & E.Nardi | 3 |
| Aquilegia pyrenaica DC. subsp. cazorlensis (Heywood) Galiano & Rivas Mart. | 30 |
| Arabis kennedyae Meikle | 4 |
| Arabis margaritae Talavera | 1 |
| Arenaria norvegica Gunn. subsp. anglica | 2 |
| Armeria colorata Pau | 8 |
| Armeria filicaulis Boiss. subsp. trevenqueana G.Nieto Feliner | 2 |
| Armeria marginata (Levier) F.Bianchini | 2 |
| Armeria soleirolii (Duby) Godr. | 2 |
| Armeria sulcitana Arrigoni | 1 |
| Armeria villosa Girard subsp. carratracensis (Bernis) G.Nieto Feliner | 5 |
| Artemisia campestris L. subsp. bottnica A.N.Lundström ex Kindb. | 1 |
| Artemisia gallica Willd. subsp. densiflora (Viv.) Gamisans | 1 |
| Artemisia granatensis Boiss. | 17 |
| Artemisia molinieri Quézel, Barbero & Loisel | 1 |
| Arum purpureospathum P.C.Boyce | 4 |
| Asparagus pastorianus Webb & Berthel. | 9 |
| Asperula crassula Greuter & J.Zaffran | 12 |
| Asperula muscosa Boiss. & Heldr. | 1 |
| Asperula paui Font Quer | 4 |
| Asphodelus bento-rainhae P.Silva | 4 |
| Asplenium adulterinum Milde | 1 (spores) |
| Asplenium majoricum Litard. | 2 (spores) |
| Aster pyrenaeus ex DC. | 20 |
| Aster sorrentinii (Tod.) Lojac. | 1 |
| Astragalus alopecuroides L. | 4 |
| Astragalus drupaceus Orphan. ex Boiss. | 1 |
| Astragalus echinus DC. var. chionistrae (H.Lindb.) Meikle | 2 |
| Astragalus idaeus Bunge | 1 |
| Astragalus macrocarpus DC. subsp. lefkarensis Meikle & C.Agerer-Kirchhoff | 15 |
| Astragalus maritimus Moris | 2 |
| Astragalus raphaelis G. Ferro | 2 |
| Astragalus thermensis Vals. | 1 |
| Astragalus tremolsianus Pau | 2 |
| Astragalus verrucosus Moris | 3 |
| Asyneuma giganteum (Boiss.) Bornm. | 1 |
| Aubrieta erubescens Griseb. | 1 |
| Aubrieta scyria Halacsy | 2 |
| Avenula crassifolia (Font Quer) J.Holub | 1 |
