阿尔泰乌头 a er tai wu tou

Caudex narrowly obconical, 3--4 cm, ca. 1 cm in diam. Stem 70--100 cm, branched, basally glabrous, apically sparsely pubescent. Proximal cauline leaves long petiolate; petiole to 15 cm, withered at anthesis, distal ones shortly petiolate; leaf blade pentagonal, to 5 × 6.5 cm, abaxially glabrous, adaxially appressed pubescent at veins, base cordate, 3-sect or -parted nearly to base; central segment rhombic, pinnately parted nearly to midvein, ultimate lobes linear; lateral segments unequally 2-parted nearly to base. Inflorescence 8--15 cm, many flowered; rachis and pedicels spreading pubescent; proximal bracts leaflike, others linear. Pedicels 0.7--2 cm, with 2 bracteoles proximally or distally; bracteoles narrowly linear, 2.5--3 mm. Sepals blue-purple, abaxially sparsely pubescent; lower sepals ca. 0.6 cm; lateral sepals orbicular-obovate, ca. 1.2 cm; upper sepal navicular, ca. 1.4 cm from base to beak. Petals glabrous; limb ca. 8 mm; lip ca. 4.5 mm; spur ca. 1 mm. Stamens glabrous; filaments entire. Carpels 3, abaxially sparsely pubescent. Follicles 1--1.3 cm. Seeds ca. 3.5 mm. Fl. Aug--Sep.

Grassy slopes; ca. 1800 m. Xinjiang (Burqin Xian) [Mongolia, Russia (C Siberia)].