宁武乌头 ning wu wu tou

Caudex unknown. Stem purplish, ca. 75 cm, shortly 2-branched below inflorescence, glabrous. Middle cauline leaves slightly long petiolate; petiole ca. 4 cm, glabrous; leaf blade pentagonal, ca. 10 × 1.25 cm, papery, abaxially glabrous, adaxially sparsely appressed pubescent, 3-sect; central segment rhombic, apex acuminate, bipinnatipartite nearly to midvein, ultimate lobes lanceolate-linear or linear, 2--3.5 mm wide; lateral segments shortly stipitate, obliquely flabellate, unequally 2-parted nearly to base. Inflorescence terminal, ca. 7 cm, ca. 8-flowered; rachis and pedicels 3--3.7 cm, proximally with 2 bracteoles; bracteoles narrowly linear, 4--5 mm. Sepals purple, adaxially glabrous; lower sepals narrowly elliptic, ca. 1.2 cm; lateral sepals orbicular-obovate, ca. 1.3 cm; upper sepal galeate, ca. 1.8 cm high, shortly clawed, ca. 1.3 cm from base to beak. Petals glabrous; limb ca. 1.1 cm; lip ca. 6 mm, slightly concave at apex; spur circinate, ca. 4.5 mm, apex globose. Stamens glabrous; filaments entire. Carpels 3, glabrous. Fl. Aug.

* By streams; ca. 1500 m. Shanxi (Ningwu Xian).