山西马先蒿 shan xi ma xian hao

Herbs perennial, to 70 cm tall. Stems hollow, with lines of hairs. Leaves lanceolate-linear, 5--12 X 0.8--4.5 cm, with sparse, long, white hairs, pinnatipartite; segments 9--15 pairs, triangular-ovate to lanceolate-oblong, pinnatifid, margin dentate-incised, teeth callose. Inflorescences to 18 cm, interrupted basally; bracts leaflike, longer than flowers. Calyx ca. 1.4 cm, slightly cleft anteriorly; lobes 5, unequal, posterior lobe smaller than lateral ones. Corolla pale yellow, ca. 4.5 cm, densely glandular pubescent throughout; tube to 2.5 cm; galea margin not densely pubescent, apex obtuse. Filaments glabrous. Capsule oblong-ovoid, slightly compressed, ca. 2 cm X 9 mm, apex acute. Seeds triangular, ca. 4 X 2 mm. Fl. Jun--Aug, fr. Jul--Sep.

* Alpine grassy slopes, thickets; 1200--2400 m. Henan, Shaanxi, Shanxi.