纤茎马先蒿 xian jing ma xian hao

Herbs 5--30 cm tall, glabrous. Roots fibrous or fusiform, fleshy. Stems clustered, unbranched, slender, flexuous. Basal leaves cespitose, petiole to 8 cm. Stem leaves opposite; petiole 2--4 cm; leaf blade ovate-oblong, 2--3 X ca. 1 cm, pinnatisect; segments 6--8 pairs, ovate-lanceolate, pinnatifid, dentate. Flowers axillary. Pedicel 4--6 mm. Calyx campanulate, glabrous, 1/3 cleft anteriorly, ca. 7.5 X 3 mm; lobes 5, entire, posterior one subulate, lateral lobes lanceolate or ovate. Corolla tube slightly longer than calyx, 8--9 mm; galea bent at a right angle apically; beak bent ± downward, straight, to 5 mm, slender; lower lip ca. 1.1 cm wide, glabrous, lobes rounded, middle one ca. 1/2 as long as lateral pair, not hoodlike. Anterior filament pair long pubescent. Capsule lanceolate, 1--1.3 cm X ca. 4 mm, apex acute. Seeds ovoid, ca. 1.5 X 0.75 mm. Fl. Jul--Aug, fr. Aug--Sep.

About 4000 m. S Xizang [Bhutan, Nepal, Sikkim].