四齿四棱草 si chi si leng cao

Chienodoxa tetrodonta Sun, Acta Phytotax. Sin. 1: 22. 1951.

Herbs 30-70 cm tall. Stems erect, puberulent; internodes 0.5-6 cm. Petiole 3-8 cm; leaf blade ovate, 1-1.4 X 0.7-0.9 cm or smaller, papery, minutely hirsute, base cuneate, margin serrate, apex acute. Cymes 1-3-flowered. Open flowers unknown. Cleistogamous flowers: Calyx 8-veined; teeth 4, linear-lanceolate, 2.5 X 0.8 mm, entire, ciliate. Corolla ca. 1.5 mm, early deciduous, 2-lipped; lower lip 3-lobed, central lobe ca. 0.5 mm, acute, with lateral lobes similar to upper lobes of upper lip; upper lip erect, 2-lobed, lobes ovate, ca. 0.2 mm. Stamens 4, didynamous, shorter than corolla; disc cup-shaped. Ovary pubescent, ca. 0.5 mm. Style as long as ovary, glabrous. Fruiting calyx broadly lanceolate, 3.5-4 X 1.3 mm. Nutlets ca. 3 X 2 mm, pubescent. Fl. and fr. May-Jul.

* Mountain slopes in thickets; 500-1800 m. N Guizhou, C Sichuan.