硕大马先蒿 shuo da ma xian hao

Herbs perennial, drying black. Stems more than 60 cm tall, erect, hollow, pubescent, with oblong scales at base. Basal leaves withering early; stem leaves clasping, sessile, oblong-linear, to 9 X 1.2 cm, base auriculate, margin incised-double dentate, teeth more than 40 pairs, apex acute. Inflorescences to 20 cm; bracts leaflike. Calyx to 1.2 cm, densely pubescent; lobes 5, serrulate. Corolla yellow, ca. 2.5 cm; tube slender, 1.4 cm; galea inconspicuously navicular, margin long pubescent; beak short, indistinct, apex 2-cleft; lower lip ca. 8 mm X 1 cm, lobes denticulate. 2 filaments pubescent, 2 glabrous. Fl. Jul--Sep, fr. Sep.

* High weedy slopes, grassy and scrubby slopes; 3000--4200 m. Gansu, E Qinghai, N Sichuan.