阴郁马先蒿 yin yu ma xian hao

Herbs perennial, 15--50 cm tall. Stems hollow, with lines of hairs. Leaves linear to linear-lanceolate, to 8 X 2 cm, abaxially with long hairs along midvein, adaxially white pubescent, pinnatipartite; segments triangular to ovate, incised-double dentate. Inflorescences to 20 cm, often interrupted basally; bracts triangular-ovate, shorter than flowers, pubescent. Calyx to 1.5 cm, densely pubescent to subglabrous; lobes 5, ± equal, linear-lanceolate, entire or obscurely serrate. Corolla yellow, 2.6--3 cm; tube barely exceeding calyx lobes, pubescent; galea 4--5 mm wide, margin densely pubescent, apex obtuse or acute. Filaments glabrous. Fl. Jun--Aug, fr. Jul--Sep. 2n = 16.

Alpine and subalpine wet meadows, shrubby grassland; 2700--3200 m. Gansu, Shanxi [Mongolia, Russia (Siberia, Far East)].