Tuber carrot-shaped, 2--3.5 cm, 0.9--1.4 cm in diam. Stem ca. 70 cm, apically branched, middle sparsely spreading pubescent, elsewhere glabrous. Middle cauline leaves long petiolate; petiole ca. 5.5 cm, sparsely spreading pubescent; leaf blade subpentagonal, ca. 5.4 × 8.5 cm, leathery, abaxially glabrous, adaxially pubescent at veins, base cordate, 3-parted; central lobe rhombic, 3-parted, ultimate lobes narrowly ovate; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence terminal, 2-or 3-flowered; rachis glabrous; bracts leaflike. Pedicels 1.7--2.5 cm, sparsely spreading pubescent nearly to apex, rarely glabrous, with 2 bracteoles at middle; bracteoles narrowly elliptic, oblong, or linear, 5--7.5 mm, adaxially pubescent at veins, margin ciliate. Sepals blue, glabrous; lower sepals narrowly ovate or oblong, 0.7--1.4 cm; lateral sepals obliquely broadly obovate, ca. 1.3--1.6 cm; upper sepal high galeate, 1.5--1.7 cm high, shortly beaked, lower margin slightly concave, 1.6--1.7 cm. Petals glabrous; claw ca. 1.4 cm; limb ca. 7.5 mm; lip ca. 4 mm, 2-lobed at apex; spur incurved, ca. 2 mm. Stamens ca. 6 mm, glabrous; filaments entire. Carpels 5, glabrous.
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