Caudex unknown. Stem ca. 1 m, apically shortly branched, glabrous. Middle cauline leaves long petiolate; petiole ca. 7 cm, glabrous or nearly so; leaf blade cordate-pentagonal, ca. 7.5 × 10 cm, abaxially glabrous, adaxially sparsely appressed pubescent at veins, 3-sect; central segment rhombic-ovate, apex long acuminate, subpinnately parted, ultimate lobes narrowly triangular to linear-lanceolate; lateral segments obliquely flabellate, unequally 2-parted nearly to base. Inflorescence: compound ones ca. 70 cm, many flowered; terminal one 35--36 cm, 30--58-flowered; rachis and pedicels glabrous; proximal bracts leaflike, distal ones 3-fid or linear. Pedicels 1.8--6 cm, with 2 bracteoles near middle; bracteoles 5--8 mm, glabrous, rarely leaflike. Sepals purplish, abaxially glabrous, adaxially sparsely villous; lower sepals narrowly oblong, 1.1--1.3 cm × 2--4 mm; lateral sepals obliquely broadly obovate, ca. 1.2 cm; upper sepal high galeate, ca. 1.8 cm high, shortly clawed, shortly beaked, ca. 1.5 cm from base to beak, lower margin slightly concave. Petals glabrous or nearly glabrous; claw geniculate at apex; limb ca. 9 mm; lip ca. 3.5 mm, slightly concave at apex; spur incurved, ca. 2 mm. Stamens glabrous; filaments entire. Carpels 3(or 4), glabrous. Fl. Aug.
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