第氏马先蒿 di shi ma xian hao

Herbs annual, to 90 cm tall, not drying black. Stems single, purplish black, rigid; branches in whorls of 4, slender, with 4 lines of hairs. Leaves often in whorls of 4; petiole ca. 5 mm; leaf blade oblong to ovate-oblong, 2--3.5 X 1--1.5 cm, abaxially subglabrous, adaxially sparsely pubescent, pinnatisect to pinnatipartite; segments linear to oblong, incised-double dentate. Pedicel short. Calyx 7--8 mm, glabrous; lobes 5, unequal, posterior lobe triangular and ± entire; lateral lobes larger, ovate, serrate. Corolla yellow, ca. 1.5 cm; tube slightly longer than galea; galea falcate apically; beak 1--1.5 mm; lower lip ca. as long as galea, apex of middle lobe acuminate. Filaments glabrous. Fl. Aug, fr. Sep--Oct.

* Meadows, grassy slopes; 2000--2500 m. W Hubei, C Sichuan.