秦岭乌头 qin ling wu tou

Caudex unknown. Stem twining, usually purple, middle ca. 2.5 mm in diam., branched. Cauline leaves with petiole ca. 3.2 cm, retrorse pubescent; leaf blade pentagonal, ca. 7.5 × 9 cm, abaxially sparsely pubescent at veins, adaxially sparsely appressed pubescent, 3-sect; central segment narrowly rhombic, shortly stipitate, apex acuminate; lateral segments nearly sessile, obliquely flabellate, unequally 2-parted. Inflorescence 2--4 cm, 2--5-flowered; rachis and pedicels densely retrorse and appressed pubescent; basal bracts 3-fid, others linear. Pedicels 1.5--2 cm, with 2 bracteoles near middle; bracteoles subulate, 3.5--5 × ca. 0.4 mm, pubescent. Sepals blue-purple when dried, abaxially pubescent; lower sepals ca. 1.3 cm; lateral sepals 1.2--1.4 cm; upper sepal galeate, ca. 1.7 cm high, with a beak ca. 5 mm, ca. 1.5 cm from base to beak, lower margin concave. Petals sparsely pubescent; limb ca. 8.5 mm; lip ca. 3.5 mm, 2-lobed; spur incurved, ca. 1.4 mm. Stamens glabrous; filaments entire or 2-denticulate. Carpels 5, appressed pubescent. Fl. Sep.

* Mountains; 2900--3000 m. Shaanxi (Taibai Shan).