石山冠唇花 shi shan guan chun hua

Herbs. Stems much branched, glabrous except for floccose-pilose grooves. Petiole 1-2.5 cm; leaf blade broadly ovate-triangular, 2-3 × 2-3 cm, adaxially sparsely strigose, abaxially subglabrous or very sparsely spreading pilose on very elevated veins, base truncate to broadly cuneate, margin narrowly serrate, apex acuminate. Panicles terminal, lax, spreading glandular pilose, cymes 3-6-flowered, in axils of gradually reduced leaves; peduncle 5-10 mm; bracts lanceolate, ± shorter than calyx. Calyx broadly tubular, 5-7 mm; teeth acuminate, posterior tooth lanceolate, ca. 2.5 × as long as other teeth, anterior teeth narrowly triangular; fruiting calyx dilated, to 1 cm, subglabrous. Corolla yellow, 2-2.5 cm, pilose; upper lip semicircular, 5-8 mm, ligulate, base with curved auricles 1-2 mm; lower lip spreading, subequal upper, undulate; middle lobe longer, ovate; lateral lobes narrowly elliptic. Nutlets black-brown, triquetrous, obovoid, somewhat corrugate.

* Rocky mountains; ca. 2600 m. Yunnan.