单头糙苏 dan tou cao su

Roots thick. Stems ca. 10 cm tall, densely stellate pannose. Petiole 1-6 cm; basal and stem leaf blades ovate-triangular, 3-5 × 1.3-2.6 cm, adaxially stellate pubescent and simple hairy, abaxially stellate tomentulose, base cordate, margin crenate, apex rounded. Verticillasters apical, solitary, ca. 16-flowered; floral leaves subverticillate, petiole 6-11 mm, densely stellate pannose, blade ovate to broadly cuneate; bracts subulate, 9-10 mm, slightly rigid, densely stellate ciliate, puberulent. Calyx teeth semicircular, apex truncate or emarginate, with spines 1-2 mm, puberulent except for apical pilose tuft inside. Corolla purple, ca. 2.2 cm, tube glabrous basally, stellate tomentulose near throat outside, villous annulate inside, limb densely white stellate tomentulose except for bearded back of upper lip outside; upper lip ca. 8 mm, margin denticulate, bearded inside; lower lip ca. 6 × 8 mm, middle lobe largest, obcordate, ca. 4 × 6 mm; lateral lobes ovate, margin irregularly denticulate. Stamens included, glabrous; posterior filament appendages at base far above annulus. Nutlets apex densely stellate tomentose. Fl. Sep.

* Valley grasslands. Gansu (Yongchang Xian).