宾川乌头 bin chuan wu tou

Caudex carrot-shaped, ca. 6 cm, ca. 2 cm in diam. Stem 50--100 cm, simple or branched, basally glabrous, apically sparsely retrorse pubescent. Proximal cauline leaves long petiolate; petiole 36--40 cm, nearly glabrous, base shortly sheathed; leaf blade reniform-pentagonal, 12--20 × 16--30 cm, herbaceous, abaxially glabrous, adaxially sparsely pubescent, 3-sect; central segment long stipitate, triangular, ultimate lobes linear-lanceolate or narrowly triangular; middle cauline leaf 1, shortly petiolate, smaller. Inflorescence ca. 40 cm, many flowered; rachis and pedicels densely retrorse white pubescent and spreading yellow pubescent; basal bracts leaflike, others ovate. Pedicels 2--4.5 cm, with 2 bracteoles at middle or below; bracteoles elliptic or ellipsoid-ovate, 0.8--1.4 cm × 4--4.5 mm. Sepals purple, abaxially mixed white and yellow pubescent; lower sepals ca. 1.4 cm; lateral sepals ca. 1.5 cm; upper sepal navicular-galeate, 1.8--2 cm from base to beak. Petals glabrous; limb ca. 1 cm; lip ca. 5 mm; spur ca. 1 mm. Stamens glabrous; filaments 2-denticulate. Carpels 5, yellowish pubescent. Fl. Sep.

* Mountain slopes, forest margins; 3400--4000 m. Yunnan (Jianchuan Xian).