Veratrum n. : A genus of coarse liliaceous herbs having very poisonous qualities.

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Taxonomy
Veratrum, plant, treatment, Veratrum lobelianum, genus, Lepidoptera species, herbs, li lu, Veratrum album, free encyclopedia, toxicity, Search, Veratrum californicum, cancer treatment, bradycardia, Native Americans, the roots, unranked.

Defination from the web:
Veratrum are known both in western herbalism and traditional Chinese medicine as toxic herbs to be used with great caution. ... Veratrum species are used as food plants by the larvae of some Lepidoptera species including Setaceous Hebrew Character. ...