Tuber carrot-shaped, ca. 4.5 cm, ca. 1 cm in diam. Stem ca. 1 m, from base to below inflorescence branched, branches 12--28 cm, basally glabrous, apically sparsely spreading and retrorse pubescent. Cauline leaves ca. 14, lowermost ones withered at anthesis, middle ones slightly long petiolate; petiole ca. 4.5 cm; leaf blade orbicular-pentagonal, ca. 6 × 7 cm, abaxially glabrous, adaxially sparsely pubescent at veins, 3-sect; central segment rhombic, subpinnatisect, ultimate lobes linear, ca. 2.5 mm wide; lateral segments obliquely flabellate, unequally 2-parted nearly to base. Inflorescence terminal, ca. 28 cm, ca. 10-flowered; rachis and pedicels densely retrorse and appressed pubescent. Proximal pedicels 6.5--11 cm, distal ones ca. 1.5 cm, distally with 2 bracteoles; bracteoles usually leaflike, 1--2.2 cm, distal ones narrowly linear. Sepals blue-purple, abaxially glabrous; lower sepals elliptic or narrowly oblong; lateral sepals obliquely broadly obovate; upper sepal high galeate, ca. 1.5 cm high, beaked, lower margin suberect. Petals glabrous; spur obliquely incurved, subglobose; lip slightly concave at apex. Stamens glabrous; filaments entire. Carpels 3, glabrous. Fl. Jul--Aug.
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