black root(redirected from physic root)
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Dried rhizome and roots of Veronicastrum virginicum (family Serophulariaceae). Indigenous to North America. Formerly used as a cathartic.
Culver’s rootHerbal medicine
A perennial herb, the root of which has leptandrin, resin, saponins, tannins and volatile oil; it is laxative, and has been used for chronic indigestion and liver disorders.