口外糙苏 kou wai cao su

Stems ca. 75 cm tall, spreading bristly, much branched toward apex. Petiole 0.3-4 cm; stem leaf blades ovate, 2-12 × 1.2-7.5 cm, spreading bristly, adaxially minutely hispid, abaxially pilose, base shallowly cordate to rounded, margin coarsely dentate-serrate, apex acuminate to acute. Verticillasters numerous, 6-16-flowered; floral leaves subsessile, 2.1-13 × 1-8 cm, spreading bristly; bracts linear-subulate, rigid, 0.9-1.5 cm, subequal to calyx, densely spreading bristly. Calyx tubular, ca. 11 × 6 mm, subglabrous outside, veins sparsely spreading bristly; lobes double toothed, spines rigid, ca. 1.5 mm; teeth broadly triangular, tufted hairy inside. Corolla white, ca. 1.9 cm; tube ca. 1.1 cm, glabrous outside, pilose annulate inside; upper lip ca. 8 mm, margin denticulate, densely silky-tomentose outside, bearded inside; lower lip ca. 7 × 8 mm, middle lobe obovate, ca. 5 × 3.5 mm; lateral lobes ovate. Stamens included; posterior filaments with a short-spurred appendage. Fl. Aug-Sep.

* Hillsides, wet areas. Hebei.