black root

lep·tan·dra

(lep-tān'dră),

Dried rhizome and roots of Veronicastrum virginicum (family Serophulariaceae). Indigenous to North America. Formerly used as a cathartic.

Synonym(s): black root, Culver root

Culver’s root

Herbal 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.

black root

(blak rūt)

Herbal made from Veronicastrum virginicum; foul-tasting, used as an emetic and cathartic; purported value in therapy for hepatic and biliary disorders. Hepatotoxicity reported.
Synonym(s): Culver's root, high veronica, physic root, tall speedwell, veronica.