曲茎马先蒿 qu jing ma xian hao

Herbs perennial, low or to 40 cm tall, pubescent. Stems flexuous, striate apically. Leaves opposite; petiole 1.5--6 cm, pubescent; leaf blade ovate-oblong, to 5 X 2.5 cm; segments 8--14 pairs, oblong, pinnatilobate to pinnatisect, dentate, teeth callose. Flowers interrupted basally; bracts leaflike. Calyx cylindric-campanulate, 8--9 mm, villous; lobes 5, unequal, posterior one triangular and entire, lateral ones larger, serrate. Corolla tube 1.8--2.2 cm, pilose; galea falcate; beak bent downward, straight; lower lip ovate-rounded, middle lobe much smaller than lateral lobes. 2 filaments pubescent, 2 glabrous. Capsule lanceolate, 0.9--1.2 cm, apex acute. Seeds ovoid. Fl. Jun--Aug, fr. Jul--Sep.

Forests, moist stream beds; 2800--4000 m. S Xizang [Bhutan, C and E Nepal, Sikkim].