陕西乌头 shan xi wu tou

Caudex unknown. Stem twining, branched, sparsely spreading pubescent. Middle cauline leaves slightly long petiolate; petiole ca. 2.5 cm; leaf blade cordate-pentagonal, ca. 8.3 × 10 cm, with short stipe ca. 3.5 mm, lateral segments nearly sessile, appressed pubescent, abaxially glabrous or nearly glabrous, base cordate, 3-sect; central segment narrowly ovate-rhombic, crenate and obliquely flabellate, unequally 2-parted. Inflorescence 8--10 cm, 5--9-flowered; rachis and pedicels spreading and retrorse white pubescent; basal bracts leaflike, others narrowly lanceolate to linear. Pedicels 1.8--2.5 cm, with 2 bracteoles at middle; bracteoles subulate, 2.5--5 × ca. 0.5 mm. Sepals spreading pubescent abaxially; lower sepals ca. 1.1 cm; lateral sepals ca. 1.3 cm; upper sepal high galeate, 1.7--1.8 cm high, not clawed, beak obliquely downward pointing, 1--1.3 cm from base to beak, lower margin concave. Petals ca. 9.5 mm; limb ca. 7.5 mm; lip ca. 4 mm, 2-lobed at apex; spur incurved, ca. 2 mm, upper part sparsely pubescent. Stamens glabrous; filaments entire. Carpels 5, glabrous. Fl. Aug.

* Mountains; ca. 1600. Shaanxi (Zhouzhi Xian).