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genus Arnicagenus Arnoseris
genus Arrhenatherum
genus Artamus
genus Artemia
genus Artemisia
genus Arthropteris
genus Artocarpus
genus Arum
genus Arundinaria
genus Arundo
genus Arvicola
genus Asarum
genus Ascaphus
genus Ascaridia
genus Ascaris
-- genus Asclepias --
genus Ascophyllum
genus Asimina
genus Asio
genus Aspalathus
genus Asparagus
genus Aspergillus
genus Asperula
genus Asphodeline
genus Asphodelus
genus Aspidelaps
genus Aspidiotus
genus Aspidistra
genus Aspidophoroides
genus Aspis
genus Asplenium
genus Astacus
genus Asclepias
| Noun | 1. |  genus Asclepias - genus of chiefly North American perennial herbs: silkweed; milkweedSynonyms: Asclepias |