盐源乌头 yan yuan wu tou

Caudex obovate or carrot-shaped, 6--10 cm, 1.2--2 cm in diam. Stem 1--1.6 m tall, apically branched, basally sparsely spreading pubescent. Basal leaves withered at anthesis; proximal and middle cauline leaves long petiolate; petiole 5--15 cm; leaf blade pentagonal, 8--12 × 10--16 cm, papery, abaxially appressed pubescent at veins, adaxially appressed pubescent, base cordate, 3-sect; central segment broadly rhombic, pinnately parted; lateral segments obliquely flabellate, unequally 2-parted nearly to base. Inflorescence terminal or axillary, 5--15-flowered; rachis and pedicels densely retrorse white or yellowish pubescent; bracts leaflike. Pedicels 1--5 cm, distally with 2 bracteoles; bracteoles usually leaflike. Sepals purplish, abaxially pubescent; lower sepals oblong, ca. 8 × 3 mm; lateral sepals obliquely broadly obovate, ca. 1 × 1.2 cm; upper sepal galeate, ca. 1 cm high, shortly beaked, ca. 1.4 cm from base to beak, lower margin suberect. Petals glabrous, ca. 1.4 cm; claw geniculate at apex; limb ca. 8 × 2.5 mm; lip ca. 4 mm, 2-lobed at apex; spur incurved, ca. 3 mm. Stamens glabrous; filaments entire. Carpels 4, glabrous.

* Abies forests; 3600--3900 m. Sichuan (Yanyuan Xian).