Hemp Nettle
Galeopsis Tetrahit. Mint Family.
Stem.--Bristly-hairy; swollen below the joints; branching. Leaves.--Opposite; pinkish; oval; coarsely toothed. Flowers.--Small; yellowish, or variegated; in whorls in the axils of the leaves. Calyx.--Five-toothed; the teeth spiny-tipped. Corolla.--Two-lipped; the lower lip three-cleft, spreading; sometimes with a purple spot. Stamens.--Four. Pistil.--One, with two-lobed style. Ovary.--Deeply four-lobed.
Somewhat late in summer the hemp nettle overruns waste places near civilization, this plant being one of our emigrants from Europe.