纤管马先蒿 xian guan ma xian hao

Herbs perennial, to 20 cm tall. Stems numerous, erect or ± diffuse, long pubescent when young, glabrescent. Leaves basal and on stem, alternate; petiole to 4 cm, long pubescent; leaf blade oblong or linear-oblong, to 3.5 X 1.1 cm, pinnatisect; segments 8--11 pairs, widely spaced, ovate, becoming glabrous or sparsely pubescent, dentate. Proximal flowers axillary, distal ones dense, ± sessile; bracts leaflike. Calyx ca. 1 cm X 3 mm, sparsely long pubescent, deeply cleft anteriorly; lobes 3--5, unequal, posterior-lateral pair largest, pinnatifid. Corolla white; tube erect, slender, 6.5--7.5 cm X ca. 1 mm; galea strongly twisted, 9--10 mm, glandular pubescent; beak S-shaped; lower lip ca. 8 mm X 1.7 cm, finely ciliate, middle lobe truncate. Anterior filament pair sparsely pubescent apically. Fl. Jul, fr. Aug.

* Alpine meadows; ca. 4000 m. SW Sichuan, Yunnan.