Caudex 1--3 cm, 5--8 mm in diam., chainlike. Stem 40--90 cm, apically branched or simple, basally sparsely retrorse pubescent or nearly glabrous, with leaves equally arranged along stem. Proximal cauline leaves withered at anthesis, and middle ones long petiolate; petiole 3.5--6 cm; leaf blade pentagonal, 3.8--5.6(--7.2) × 4.5--8(--10) cm, both surfaces sparsely pubescent or nearly glabrous, 3-sect or-parted nearly to base; central segment broadly rhombic, subpinnatifid; lateral segments obliquely flabellate. Inflorescence terminal, 2--6-flowered; rachis and pedicels sparsely spreading pubescent; bracts linear or lanceolate. Pedicels 0.6--1.5(--4.5) cm, distally with 2 bracteoles, rarely at middle; bracteoles narrowly linear, 3.4--4.5 mm. Sepals purple, abaxially sparsely spreading pubescent; lateral sepals 1.2--1.3 cm; upper sepal galeate, 1.4--1.7 cm high, lower margin arciform-curved; lower sepals 0.8--1 cm. Petals nearly glabrous; limb ca. 7 mm; lip ca. 4 mm; spur incurved, ca. 1 mm. Stamens glabrous; filaments entire. Carpels 3, glabrous. Fl. Jul--Aug.
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