Stems slender, smooth, erect and stiff, 1 to 3 feet high from a perennial root, simple or with erect or ascending branches. Leaves opposite, short petioled, linear-lanceolate to ovate-lanceolate, with sharply toothed margins, the principal veins rather prominent. Flowers 1 to 11/2 inches long, white or slightly pinkish, crowded in a dense terminal spike and often a few in the upper axils. Calyx five-parted, segments ovate-oblong, with smooth bracts at the base. Corolla irregular, tubular, inflated and two-lipped; upper lip arched, concave, entire or slightly notched and covering the lower lip while the flower is immature; under lip three-lobed, spreading in maturity and woolly within. Stamens five, only four of which bear anthers, the sterile one smaller. Fruit an ovoid capsule about one-half of an inch high.
Memoir 15 N. Y. State Museum
Plate 197 turtlehead; snakehead; balmony - Chelone glabra