无毛乌头 wu mao wu tou

Plants glabrous throughout. Caudex carrot-shaped, 3--4.5 cm, 7--10 mm in diam. Stem ca. 64 cm, simple, glabrous, with leaves equally arranged and crowded along stem. Proximal cauline leaves withered at anthesis, middle ones slightly long or shortly petiolate; petiole ca. 3.5 cm; leaf blade orbicular-pentagonal, 3.8--5 × 5.5--6.5 cm, thinly leathery, 3-sect; central segment broadly obovate, dissected; ultimate lobes linear, 1.5--3 mm wide; lateral segments obliquely flabellate, unequally 2-parted nearly to base. Inflorescence ca. 20 cm, ca. 10-flowered; proximal bracts leaflike, others linear. Pedicels 1--4 cm, distally with 2 bracteoles; bracteoles subulate-linear, 2--3.5 × 0.5--0.7 mm. Sepals blue-purple; lower sepals ca. 0.9 cm; lateral sepals ca. 1.3 cm; upper sepal navicular-galeate or navicular, 5--8 mm wide, 1.2--1.4 cm from base to beak, lower margin concave. Petals glabrous; limb ca. 8 mm; lip ca. 3.5 mm, apex slightly concave; spur curved, ca. 1.5 mm. Filaments entire. Carpels 5. Fl. Sep.

* Slopes. W Sichuan (Kangding Xian).