垂花乌头 chui hua wu tou

Caudex unknown. Stem ca. 1.5 m tall, many branched, basally spreading pubescent, apically retrorse pubescent, with leaves equally arranged along stem. Middle cauline leaves with petiole ca. 4 cm, glabrous; leaf blade pentagonal, 8.5--10 × ca. 12 cm, abaxially glabrous, adaxially sparsely appressed pubescent, 3-parted; central lobe rhombic, apex acuminate; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence terminal, ca. 20 cm, 7--12-flowered; rachis retrorse pubescent; proximal bracts leaflike, distal ones elliptic or lanceolate to narrowly linear. Pedicels decurved at apex, 2.5--5 cm, spreading pubescent, proximally with 2 bracteoles; bracteoles subulate, 2.5--3.5 × ca. 0.3 mm, glabrous. Sepals blue or blue-white; lower sepals ca. 1.4 cm; lateral sepals ca. 1.7 cm; upper sepal navicular, glabrous, lower margin 1.7--2.1 cm, slightly concave. Petals ca. 2.2 cm, glabrous; claw slightly geniculate at apex; lip 3--3.5 mm, apex slightly concave; spur subcircinate, ca. 2.5 mm. Stamens glabrous; filaments entire. Carpels 3(--5), glabrous. Follicles 1.4--1.7 cm. Seeds ca. 4 mm. Fl. Aug.

* Forests; ca. 3600 m. SE Xizang (Zayü Xian).