显柱乌头 xian zhu wu tou

Caudex carrot-shaped, ca. 6 cm, ca. 1 cm in diam. Stem 70--90 cm, simple, retrorse and appressed pubescent, with leaves equally arranged along stem. Proximal cauline leaves withered at anthesis, middle ones slightly long petiolate; petiole 4--8 cm, sparsely retrorse pubescent; leaf blade pentagonal, 5.5--8 × 8.5--12 cm, abaxially nearly glabrous, adaxially sparsely appressed pubescent or at veins pubescent, 3-parted; central lobe broadly rhombic; lateral lobes obliquely flabellate, unequally 2-fid slightly beyond middle. Inflorescence 17--25 cm, 7--20-flowered; proximal rachis densely retrorse yellowish pubescent, distal ones and pedicels densely spreading pubescent; bracts leaflike, stipitate, upward becoming small. Pedicels 3--12 cm, distally with 2 bracteoles; proximal bracteoles leaflike or 3-fid, 1.5--3.5 cm, distal ones oblong, linear, or narrowly linear, 0.5--1.6 cm. Sepals blue-purple or white, abaxially sparsely pubescent or glabrous; lower sepals ca. 1.8 cm; lateral sepals orbicular-obovate or broadly obovate, 1.7--2.3 cm; upper sepal galeate or navicular-galeate, oblique upward, shortly beaked, 2--2 cm from base to beak. Petaline claw pubescent above middle, not or geniculate at apex; limb ca. 5.5 mm, sparsely pubescent; spur incurved, ca. 2.5 mm, glabrous. Stamens glabrous; filaments entire or 2-denticulate. Carpels 5, densely yellowish pubescent. Fl. Aug--Oct.

* Grassy slopes; 3400--4000 m. SE Xizang, NW Yunnan.