红头索 hong tou suo

Herbs perennial, to 40 cm tall. Stems prostrate, ascending, subterete, usually branched, rust-colored pilose. Leaves opposite; petiole 1--2 cm, densely pubescent; leaf blade ovate to broadly ovate, rarely suborbicular, 1.5--3.5 X 1.2--2.5 cm, papery, strigillose, sparsely transparent or dark glandular punctate, base subrounded to broadly cuneate, apex rounded to apiculate; veins 3 or 4 pairs; veinlets inconspicuous. Umbels in axils of medial leaves, 2--4-flowered; peduncle 1.8--3.5 cm; bracts ovate to orbicular-ovate, 5--14 X 3--9 mm. Pedicel 2--10 mm, densely rust-colored pubescent. Calyx lobes narrowly lanceolate, 8--9 X 1--1.2 mm, abaxially pubescent, apex acuminate. Corolla yellow; tube 3--4 mm; lobes elliptic, 7--10 X 5--6 mm, sparsely dull red glandular punctate, apex obtuse to apiculate. Filaments connate basally into a ca. 3 mm high tube, free parts 3--5 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 2 mm. Ovary rust-colored puberulous; style 5--7 mm. Capsule unknown. Fl. Jul.

* Wet areas in ravines, woodland margins; 1800--3100 m. Sichuan (Emei Shan).