Microtoena stenocalyx C. Y. Wu & S. J. Hsuan

Herbs perennial, rhizomatous. Stems 1-2 m, base semiwoody, tawny pilose, glabrescent. Petiole 1-3.7 cm; leaf blade ovate-cordate to triangular-ovate, 4.5-8.5 × 2.4-5 cm, densely tawny setose, base cordate to truncate-cuneate, margin coarsely dentate, apex long acuminate. Panicles compact, terminal, 4.5-13 × ca. 3.5 cm; cymes 3-7-flowered; lower peduncles 1-3.5 cm; bracts lanceolate, ca. 1.5 × 3-4.5 mm; bracteoles to 1.2 cm. Calyx ca. 12 × 3 mm, glandular puberulent, tawny setose on veins and teeth; teeth linear-lanceolate, subulate-acuminate, straight, posterior tooth ca. 6 mm, others ca. 4.5 mm; fruiting calyx transversely veined. Corolla yellow-white, ca. 2.5 cm, subglabrous, puberulent on back, throat to 5.5 mm wide; upper lip ca. 7 mm, with a lateral basal tooth; lower lip subequal to upper, oblong; middle lobe subcircular, ca. 3 mm in diam.; lateral lobes smaller, triangular-ovate. Nutlets black-brown, triquetrous, obovoid, base acute, ca. 1.8 × 1.2 mm. Fl. Jul, fr. Sep.

Yunnan.

* Forests, thickets; 2000-2400 m.