vervain : Idioms & Phrases
vervain family
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noun family of New World tropical and subtropical herbs and shrubs and trees
family Verbenaceae; verbena family; Verbenaceae.
WordNet
Vervain mallow
(Bot.) , a species of mallow (Malva Alcea ) with rose-colored flowers.
Webster 1913
vervain sage
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noun Eurasian sage with blue flowers and foliage like verbena; naturalized in United States
wild sage; Salvia verbenaca; wild clary.