What is a genus of leguminous plants having many species, mostly in tropical countries, several of them yielding indigo, esp. Indigofera tinctoria, and I. Anil called?

indigofera — A genus of leguminous plants having many species, mostly in tropical countries, several of them yielding indigo, esp. Indigofera tinctoria, and I. Anil. (Webster's 1913.)

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