Galeopsis tetrahit L.

Taprooted annual 2–7 dm, branched when well developed; stem swollen at the nodes, hispid-setose (notably on the angles) with long, spreading or slightly reflexed hairs, and often also with shorter but still prominent, gland-tipped hairs, especially just beneath the upper nodes; lvs petiolate, with rhombic-elliptic to ± ovate, coarsely blunt-serrate, basally rounded or cuneate, ± strigose or hirsute blade 3–10 × 1–5 cm; verticils dense, generally several, the lower often remote; cal ca 1 cm at anthesis, somewhat larger in fr, the erect spinescent lobes about equaling the tube, elongating to 5–10 mm; cor white or pink or variegated, commonly with 2 yellow or white spots; 2n=32. Native of Eurasia, intr. and often appearing as a native in our range, especially northward. June–Sept. Var. tetrahit has the cor mostly 15–23 mm, the middle lobe of the lower lip nearly square, not emarginate. Var. bifida (Boenn.) Lej. & Courtois has smaller fls, seldom over 15 mm, the central lobe of the lower lip emarginate or cleft. (G. bifida)

Arable land, sometimes in woods, fens and wet heaths.

Can be grown by seedlings.