德钦乌头 de qin wu tou

Caudex carrot-shaped or terete, 4--10 cm. Stem 40--100 cm, simple or shortly branched, or tenuibranched at middle, spreading yellowish pubescent, with leaves equally arranged along stem. Proximal cauline leaves withered at anthesis, middle ones slightly long petiolate; petiole 2.3--4 cm, sparsely spreading pubescent; leaf blade orbicular-pentagonal, 4.7--7 × 7--10 cm, abaxially becoming glabrous, adaxially sparsely appressed pubescent, 3-sect or -parted to base 1.5--2.5(--6) mm; central segment rhombic, apex acuminate, subpinnately parted, ultimate lobes linear or lanceolate-linear, 2--3 mm wide; lateral segments obliquely flabellate, unequally 2-parted nearly to base. Inflorescence terminal, 15--20-flowered, 10--35 cm; rachis and pedicels densely spreading yellowish pubescent; proximal bracts leaflike, distal ones linear. Pedicels 2--9 cm, with 2 bracteoles at middle or above; bracteoles filamentous or narrowly linear, 2.5--4 mm. Sepals blue-purple; lower sepals ca. 1.2 cm; lateral sepals ca. 1.4 cm; upper sepal galeate or navicular-galeate, abaxially glabrous, 1.6--2.3 cm from base to beak. Petals glabrous, or claw sparsely pubescent; lip ca. 3 mm; spur incurved, ca. 1.5 mm. Stamens glabrous; filaments entire. Carpels (3--) 5, sparsely spreading pubescent. Fl. Jul--Aug.

* Grassy slopes, forests; 3000--4000 m. SE Xizang (Zayü Xian), NW Yunnan.