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Tephrosia is a genus of flowering plants in the pea family, Fabaceae. It is widespread in both the Eastern and Western Hemisphere, where it is found in tropical and warm-temperate regions.The generic name is derived from the Greek word τεφρος (tephros), meaning 'ash-colored,' referring to the greyish tint given to the leaves by their dense trichomes. Hoarypea is a common name for plants in this genus.

Many species in the genus are poisonous, particularly to fish, for their high concentration of rotenone. ...