光茎大黄 guang jing da huang

Herbs large, ca. 1 m tall. Stem glabrous. Petiole of basal leaf longer than blade, glabrous; leaf blade cordate-ovate, large, 11-25 × 10-17 cm, abaxially pubescent especially along veins, adaxially glabrous, margin entire, apex acuminate. Stem leaves (absent or 1 or) 2, shortly petiolate, small. Panicle narrow, sparsely branched, glabrous. Tepals subequal, ovate, 1.5-2 mm, abaxially green with purple margin. Anthers purple, globose-ovate, 0.7-1 mm. Fruit purple, oblong-ovoid, 5-8 mm; wings 2.5-3.5 mm, with longitudinal veins near middle. Seeds ovoid. Fl. Jun-Jul, fr. Aug-Sep.

* Among rocks; 3000-3500 m. Gansu.