光茎乌头 guang jing wu tou

Caudex unknown. Stem ca. 80 cm, glabrous. Middle cauline leaves slightly long petiolate; petiole ca. 4 cm, glabrous; leaf blade pentagonal, ca. 11 × 14 cm, herbaceous, abaxially glabrous, adaxially sparsely appressed pubescent, base deeply cordate, 3-sect; central segment rhombic, apex long acuminate, subpinnatifid; lateral segments obliquely flabellate, unequally 2-parted. Inflorescence terminal, ca. 28 cm, ca. 15-flowered; rachis glabrous; proximal bracts leaflike, 3--8.5 cm, shortly stipitate, distal ones oblong, ca. 1 cm, dentate. Pedicels 0.6--2.5 cm, distally pale brown spreading pubescent, with 2 bracteoles at middle or above; bracteoles linear, 3.5--8 mm, membranous, glabrous. Sepals purple, abaxially sparsely pubescent, elsewhere glabrous; lower sepals narrowly oblong, 5--7 mm; lateral sepals suborbicular, ca. 7 mm; upper sepal galeate, ca. 7 mm high, ca. 8 mm from base to beak, lower margin concave. Petals glabrous; claw ca. 9 mm; limb ca. 7 mm; lip ca. 2.5 mm; spur circinate, ca. 2 mm. Stamens glabrous; filaments 2-denticulate. Carpels 3, glabrous. Fl. Aug--Sep.

* Forests; 3700--3900 m. NW Yunnan (Zhongdian Xian).