单花横断山绿绒蒿 dan hua heng duan shan lü rong hao

Plants rather robust, 50-120 cm tall, always with a well-developed and stout stem, often with several alternate leaves and superfluous flowers below whorl of leaflike bracts. Flowers several, often more than 3, on top of a distinct stem, often with several leaves and 1 or 2 superfluous flowers below "bracts," nodding to half-nodding, pale lemon or sulphur yellow, to 20 cm in diam. Petals spreading widely apart. Ovary sparsely hairy; styles 7-11 mm, glabrous. Capsule glabrous or subglabrous.

Rhododendron moorlands and woodlands, margins of swamps, rocky slopes, stabilized moraines; ca. 3400 m. SW Sichuan, S and SE Xizang, NW Yunnan [NE Myanmar].