Stems slender, procumbent or ascending, rooting at the nodes below, the tips at least erect and simple or branched, 3 to 20 inches high, pubescent or nearly smooth and four-angled. Leaves ovate, oblong or oblong-lanceolate, blunt or somewhat pointed at the apex, usually narrowed at the base, entire or with a few teeth, 1 to 4 inches long, the lower leaves usually shorter. Flowers in dense terminal spikes which are one-half to 1 inch long, becoming 2 to 4 inches long in fruit. Calyx oblong, green or sometimes purplish, recticulate-veined, deeply two-lipped, closed in fruit, upper lip nearly truncate with three low teeth, lower lip two-cleft with lanceolate teeth. Corolla violet, purple or lilac, sometimes white, one-third to one-half of an inch long, the top of the flower strongly two-lipped, the upper lip entire and arched, the lower lip three-lobed and spreading or drooping; the four stamens ascending under the upper lip of the corolla.

In fields, woods and waste places, everywhere common. Probably native but also naturalized from Europe. Flowering from May to October.

Memoir 15 N. Y. State Museum

Plate 187 self-heal; heal-all - Prunella vulgaris

Self heal; heal all   Prunella vulgaris