热河乌头 re he wu tou

Caudex elliptic or obconical, ca. 1--5 cm, 4--10 mm in diam. Stem 20--120 cm tall, glabrous, sparsely retrorse pubescent, or subglabrous. Proximal cauline leaves withered at anthesis, long petiolate; petiole 1.5--9 cm; leaf blade suborbicular, 3--9 × 3--12 cm, both surfaces glabrous, 3-sect; segments dissected, ultimate lobes narrowly linear or linear, 1--2 mm wide. Inflorescence terminal, 2--40 cm, 2--35-flowered, rarely a solitary flower; rachis and pedicels glabrous, sparsely retrorse pubescent, or subglabrous; proximal bracts leaflike, distal ones linear. Pedicels 4--15 mm, distally with 2 bracteoles; bracteoles subulate. Sepals blue-purple, abaxially glabrous; lower sepals long elliptic, 6--12 × 3--5 mm, adaxially pilose; lateral sepals broadly obovate or suborbicular, 1--1.5 cm, adaxially pilose; upper sepal navicular or navicular-galeate, ca. 1.5 cm high, lower margin 1--1.5 cm. Petals glabrous; spur slightly curved; lip 2-lobed at apex. Stamens sparsely pilose; filaments 2-denticulate. Carpels 3, or 3--5, glabrous. Follicles elliptic, ca. 1 cm. Seeds oblong, ca. 3.5 mm. Fl. Aug, fr. Sep.

Grassy slopes, forests, forest margins, grasslands; 1700--3000 m. Hebei, Nei Mongol, Shandong, Shanxi [Russia (E Siberia)].