A low, slender herb, 6 to 18 inches high; stem slender, puberulent, with opposite, wide-spreading branches. Leaves lanceolate or linear-lanceolate to ovate, opposite on the stem, short petioled, 1 to 11/2 inches long, one-eighth to one-half of an inch wide, the lower ones entire, the upper floral leaves mostly toothed with several bristle-pointed teeth at the base.
Memoir 15 N. Y. State Museum
A. Narrow-Leaved Cowwheat - Melampymm lineare
Flowers small, one-third to one-half of an inch long, white, greenish white or pale yellow with a rather bright yellow apex to the flower, borne on short stalks in the upper axils of the leaves, or in terminal, leafy-bracted clusters. Calyx bell-shaped with four long, slender teeth. Corolla tubular, enlarging above, two-lipped, the upper lip not lobed, the lower lip three-toothed and spreading. Stamens four in two pairs of unequal length, ascending under the upper lip. Fruit a flat, oblique capsule, about one-third of an inch long with a rather long beak, two to four-seeded. Common in dry woods and thickets, Nova Scotia to British Columbia, south to Georgia, Tennessee, Iowa and Idaho. Flowering from July to September.