牛扁叶乌头 niu bian ye wu tou

Caudex unknown. Stem 80--100 cm tall, branched at middle, apically sparsely retrorse and appressed pubescent. Cauline middle leaves long petiolate; petiole 7--15 cm, sparsely appressed pubescent; leaf blade pentagonal, 9--15 × 10--21 cm, papery, both surfaces sparsely pubescent, base cordate, 3-parted; central lobe unequally 2-parted beyond middle. Compound inflorescence terminal, ca. 35 cm, many flowered; rachis and pedicels yellowish spreading pubescent; bracts leaflike. Pedicel 1.5--5 cm, with 2 bracteoles near middle; bracteoles oblaceolate or linear, 5--8 × 1--2 mm, sparsely pubescent. Sepals blue, abaxially pubescent; lower sepals narrowly obovate or suboblong, ca. 1.2 × 0.5--0.8 cm; lateral sepals obliquely broadly obovate, ca. 1.4 × 1.2--1.5 cm; upper sepal navicular-galeate, 1.7--2 cm, clawed, shortly beaked, ca. 2.1 cm from base to beak. Petals ca. 2.2 cm; limb ca. 1 cm × 1.6 mm; lip ca. 5 mm, upper part sparsely pubescent; spur slightly incurved, ca. 1 mm; claw ca. 1.7 cm, spreading pubescent. Stamens pubescent; filaments entire, rarely 2-denticulate. Carpels 3, pubescent. Fl. Sep--Oct.

* Tsuga forests; 2600--2700 m. Xizang (Mêdog Xian).