维西乌头 wei xi wu tou

Caudex unknown. Stem twining, branched; branches sparsely retrorse white pubescent. Cauline leaves long petiolate; petiole ca. 5.5 cm, sparsely retrorse and spreading pubescent; leaf blade pentagonal, ca. 12 × 22 cm, papery, abaxially retrorse pubescent at veins, adaxially sparsely appressed pubescent or subglabrous, base broadly cordate, 3-parted; central lobe rhombic, apex long acuminate; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence ca. 10 cm, several flowered; rachis and pedicels villous; bracts 3-parted, 0.6--2 cm. Pedicels 2--2.5 cm, with 2 or 3 bracteoles at or above middle; bracteoles linear, 2--3 mm, villous. Sepals white; lower sepals lanceolate-oblong, ca. 1.2 cm, abaxially sparsely villous; lateral sepals obliquely broadly obovate, ca. 1.4 cm, abaxially sparsely villous; upper sepal galeate, ca. 1.5 high, shortly clawed, ca. 3 mm, beak ca. 1.5 mm, 1.5--1.6 cm from base to beak. Petals ca. 2.1 cm, glabrous; claw ca. 1.5 cm; limb ca. 9 mm; lip ca. 4 mm, 2-lobed; spur decurved, ca. 3 mm. Stamens glabrous; filaments entire or 2-denticulate. Carpels 3, glabrous.

* Mountain summits. NW Yunnan (Weixi Lisu Zu Zizhixian).