This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
Leptandra. - Synonym. - Culver's Root. The rhizome and roots of Veronica virginica Linne (nat. ord. Scrophularineae).
United States, south to Georgia, and west to Minnesota, in low grounds.
Of horizontal growth, from 10 to 15 cm. long, and about 5 mm. thick, somewhat flattened, bent and branched, deep blackish-brown, with cup-shaped scars on the upper side, hard, of a woody fracture, with a thin, blackish bark, a hard, yellowish wood, and a large, purplish-brown, about six-rayed pith; roots thin, wrinkled, very fragile; inodorous; taste bitter and feebly acrid.
Dose, 1/4 to 1 dr.; 1. to 4. gm.
Extract of Leptandra is contained in Pilulae Catharticae Vegetabiles.
Dose, 1 to 3 gr.; .06 to .20 gm.
2. Extractum Leptandrae Fluidum. - Fluid Extract of Leptandra. By maceration and percolation with Alcohol and Water, and evaporation.
Dose, 1/4 to 1 fl. dr.; 1. to 4. c.c.
Recent leptandra root acts as a violent cathartic, and sometimes as an emetic. It is an excellent cholagogue, appears to have a special influence upon the muciparous follicles of the intestine, and it acts very advantageously in cases of duodenal indigestion and chronic constipation.