Culver’s physic, Beaumont root, blackroot, bowman’s root, culver’s root, physic root, tall speedwell, whorlywort.
An erect, unbranched, smooth perennial that grows to 7 feet in height. Leaves are narrowly lanceolate and in whorls of 3 to 9 around the stem joints. Flowers are white to bluish, and crowded in several dense spikes on top of plant.
June to September.
Rich woods, thickets, moist meadows, and prairies.
Rhizomes and roots.
The rhizome is reputed to be a laxative, emetic, cholagogue, and tonic.