nCulver's physica tall perennial herb having spikes of small white or purple flowers; common in eastern North America
Webster's Revised Unabridged Dictionary
Culver's physic(Bot) The root of a handsome erect herb (Leptandra Virginica syn. Veronica Virginica) common in most moist woods of North America , used as an active cathartic and emetic; also, the plant itself.
Chambers's Twentieth Century Dictionary
nCulver's physicpopular name of a kind of speedwell, the rhizome of Veronica virginica, used medicinally.