Caudex carrot-shaped, 3.5--4 cm, 5--7 mm in diam. Stem ca. 80 cm, simple, apically sparsely retrorse pubescent, elsewhere becoming glabrous, 12-leaved. Proximal cauline leaves withered at anthesis, middle ones long or shortly petiolate; petiole 2.2--4 cm; leaf blade pentagonal, ca. 7 × 8 cm, abaxially glabrous, adaxially sparsely pubescent or nearly glabrous, 3-parted nearly to 4 mm from base; central lobe broadly rhombic or rhombic, apex acuminate; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence ca. 5 cm, 4-or 5-flowered; rachis and pedicels sparsely spreading pubescent; proximal bracts leaflike, shortly stalked, ca. 2 cm; distal ones small, ca. 4 mm. Pedicels 1.7--2.4 cm, oblique upward, with 2 bracteoles at middle; bracteoles linear-subulate, 2--3 mm; Sepals purple, abaxially sparsely pubescent; lower sepals 0.7--0.9 cm; lateral sepals 0.8--1 cm; upper sepal falcate-navicular, 1--1.2 cm from base to beak, lower margin oblique upward. Petals ca. 1 cm, glabrous; claw geniculate-curved at apex; lip ca. 4 mm; spur hemispheric, short, ca. 0.5 mm. Stamens glabrous; filaments 2-denticulate, rarely entire. Carpels 3, glabrous. Fl. Aug.
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