吉林乌头 ji lin wu tou

Rhizome unknown. Stem 80--120 cm tall, 3--5.5 mm in diam., branched, basally sparsely spreading yellow villous, apically retrorse yellow pubescent. Basal leaves ca. 2, and proximal cauline leaves long petiolate; petiole 20--30 cm, sparsely spreading pilose or nearly glabrous. Cauline leaves 2--6; leaf blade reniform-pentagonal, 12--17 × 20--24 cm, abaxially sparsely pilose at veins or nearly glabrous, adaxially appressed and retrorse pubescent, 3-parted. Inflorescence 18--22 cm, many flowered; rachis and pedicels retrorse and appressed pubescent; proximal bracts leaflike, others linear. Pedicels 0.8--1.2 cm, with 2 bracteoles at middle or below; bracteoles subulate, 1.2--4 mm. Sepals yellow, abaxially densely pubescent; lower sepals narrowly elliptic; lateral sepals broadly obovate, ca. 8 mm; upper sepal cylindric, 1.4--1.8 cm high, 4--5 mm in diam., shortly beaked, lower margin 9--10 mm, slightly concave. Petals glabrous; lip liguliform, ca. 3 mm; spur erect or incurved, slightly shorter than or subequaling lip. Stamens glabrous or sparsely ciliate; filaments entire. Carpels 3; ovary glabrous. Follicles 1--1.2 cm, glabrous. Seeds perigynous, ca. 2.5 mm. Fl. Jul--Sep, fr. Sep.

Grassy or mountain slopes, forest margins, forests. E Heilongjiang, W Henan, NW Hubei, Jilin, Liaoning, SE Shaanxi, S Shanxi [Russia (Far East)].