腋花乌头 ye hua wu tou

Caudex subterete, ca. 5 cm, ca. 6 mm in diam. Stem ca. 80 cm, simple, sparsely spreading white pubescent, apically becoming glabrous. Basal leaves and proximal cauline leaves long petiolate, withered at anthesis; petiole 2--3 cm, spreading pubescent; leaf blade pentagonal, 4--4.8 × 6--7 cm, both surfaces glabrous, 3-parted nearly to 6 cm from base, central lobe rhombic, apex acuminate; lateral lobes obliquely flabellate, unequally 2-fid nearly to middle. Flower solitary, axillary, 1.5--1.8 cm; rachis and proximal pedicels sparsely spreading pubescent, apically glabrous; bracts leaflike. Pedicels arciform-curved, 4.5--7 cm, with 2 bracteoles at middle; bracteoles leaflike, shortly stalked, 1.5--1.8 × 1.2--1.7 cm, glabrous. Sepals purple, abaxially glabrous, margin sparsely pubescent; lower sepals ca. 0.8 cm; lateral sepals ca. 0.8 cm; upper sepal navicular-galeate, 1--1.2 cm high, 0.8--1.2 cm from base to beak, lower margin oblique upward, slightly concave. Petals glabrous, ca. 8 mm; claw ca. 3.5 mm; lip ca. 2 mm, slightly concave; spur incurved, ca. 1 mm. Stamens glabrous; filaments entire or indistinctly 2-denticulate. Carpels 3, glabrous. Fl. Aug.

* Mountains; ca. 4000 m. E Xizang (Bomi Xian).