Anthoxanthum odoratum L. subsp. nipponicum (Honda) Tzvelev (Synonym : Anthoxanthum nipponicum Honda)

Family : Poaceae

Anthriscus caucalis M.Bieb. (Synonym : Cerefolium anthriscus (L.) Beck)

Family : Apiaceae [Naturalized plant]

Anthriscus sylvestris (L.) Hoffm. (Synonym : Cerefolium sylvestre (L.) Bubani)

Family : Apiaceae

Anthriscus sylvestris (L.) Hoffm. var. hirtiructus (Ohwi) H.Hara (Synonym : Anthriscus sylvestris (L.) Hoffm. f. hirtifructus (Ohwi) H.Ohba)

Family : Apiaceae

Antirrhinum majus L.

Family : Scrophulariaceae

Apera spica-venti (L.) P.Beauv. (Synonym : Anemagrostis spica-venti (L.) Trin.)

Family : Poaceae [Naturalized plant]

Aphananthe aspera (Thunb.) Planch. (Synonym : Homoioceltis aspera (Thunb.) Blume)

Family : Ulmaceae

Apocynum cannabinum L. (Synonym : Apocynum cannabinum L. var. puberulum Bég. & Belosersky)

Family : Apocynaceae [Naturalized plant]

Apocynum lancifolium Russanov (Synonym : Trachomitum lancifolium (Russanov) Pobed.)

Family : Apocynaceae

Aquilegia buergeriana Siebold & Zucc. var. oxysepala (Trautv. & C.A.Mey.) Kitam. (Synonym : Aquilegia buergeriana Siebold & Zucc. var. oxysepala (Trautv. & C.A.Mey.) Kitam. f. pallidiflora (Nakai) Kitag.)

Family : Ranunculaceae