凉山乌头 liang shan wu tou

Caudex obconical or carrot-shaped, 3--4 cm, 1--1.2 cm in diam. Stem 32--43 cm, simple or shortly 1-branched below inflorescence, sparsely retrorse and appressed yellow pubescent, with 12--15 leaves. Proximal cauline leaves withered at anthesis, middle ones slightly long petiolate; petiole ca. 4.5 cm, glabrous; leaf blade pentagonal, ca. 3.8--5.8 cm, subleathery, both surfaces glabrous, 3-sect; central segment broadly rhombic, 2- or 3-parted nearly to midvein, ultimate lobes linear, 2.5--3.6 mm wide; lateral segments obliquely flabellate, unequally 2-parted. Inflorescence 4--8 cm, 3--6-flowered; rachis and pedicels densely retrorse and appressed pubescent; proximal bracts leaflike, distal ones oblanceolate or spatulate. Pedicels 0.7--3 cm, with 2 bracteoles above middle; bracteoles linear or subulate, 3--5 × 0.5--0.8 mm. Sepals blue-purple, abaxially curved pubescent, adaxially glabrous; lower sepals ca. 0.9 cm; upper sepal navicular-galeate, ca. 7.5 mm wide, ca. 1.2 cm from base to beak. Petals ca. 1.6 cm; claw pubescent; limb ca. 9 × 1.5 mm; lip ca. 3.5 mm, sparsely pubescent, apex slightly concave; spur oblique backward, ca. 1.5 mm. Stamens sparsely pubescent; filaments entire or 2-denticulate. Carpels 5, densely appressed pubescent. Fl. Sep.

* Grassy slopes, forests; 4300--4500 m. SW Sichuan (Yuexi Xian).