苏氏马先蒿 su shi ma xian hao

Herbs annual or biennial, 20--30 cm tall, drying slightly black. Stems usually branched basally; branches 6--10, weak, often ascending, sparsely pubescent. Proximal leaves pseudo-opposite, distal ones alternate; petiole 15--25 cm; leaf blade lanceolate-oblong or ovate-oblong, 3--4 X 1--1.5 cm, abaxially sparsely pubescent along midvein or glabrous, adaxially sparsely pubescent, pinnatisect; segments 9--11 pairs, long ovate or ovate-lanceolate, pinnatifid to pinnatipartite, incised-dentate. Inflorescences racemose, 1/3--1/2 as long as branches, lax; bracts leaflike. Pedicel 1--2 cm, weak, densely pubescent. Calyx 3--5 mm, glabrous or pubescent along veins, 1/2 cleft anteriorly; lobes 5, unequal, posterior one entire, lateral lobes larger, entire. Corolla reddish or whitish, ca. 1 cm; tube erect, longer than calyx; galea twisted; beak pointed upward, S-shaped, ca. 7 mm; lower lip ciliate, middle lobe ca. 2 X 1.5 mm. Filaments pubescent. Capsule ca. 5 mm.

* Swampy places. W Sichuan.