秦氏马先蒿 qin shi ma xian hao

Herbs perennial, diffuse, puberulent when young, glabrescent. Stems woody basally, many branched; branches in whorls of 4, 10--20 cm, ascending. Leaves in whorls of 4; petiole ca. 3 cm basally, whitish, pubescent; leaf blade glabrous on both surfaces, pinnatisect; segments 5 or 6 pairs, linear, pinnatifid, incised-dentate. Flowers in whorls of 4; bracts linear. Pedicel filiform, 1--4 mm. Calyx white, ovate, ca. 5 mm, membranous, pubescent, deeply cleft anteriorly; lobes 5, unequal, posterior one linear, lateral lobes triangular, ciliate. Corolla purple; tube decurved at middle, 4--5 mm; galea erect, 5--8 mm, apex truncate; lower lip longer than galea, 1--1.2 X ca. 1 cm, ciliate; lobes ovate. 2 filaments pubescent, 2 glabrous. Capsule ca. 2 X as long as calyx, apiculate. Seeds dark, 1--2 X ca. 0.5 mm. Fl. Aug, fr. Aug--Sep.

* Woodlands; 3000--4200 m. S Gansu.