Caudex carrot-shaped, ca. 6.5 cm, ca. 1.2 cm in diam. Stem 1--1.8 m, simple, apically sparsely curved pubescent, with 14 leaves equally arranged along stem. Proximal cauline leaves withered at anthesis, and middle ones long petiolate; petiole 3--7.5 cm; leaf blade orbicular-pentagonal, 6--12 × 9--16 cm, abaxially nearly glabrous, adaxially appressed pubescent, 3-sect nearly to base; central segment rhombic or broadly rhombic, apex acuminate, nearly bipinnatipartite; lobule narrowly triangular or lanceolate; lateral segments obliquely flabellate, unequally 2-or 3-parted. Inflorescence terminal, to 38 cm, many flowered; rachis and pedicels densely retrorse pubescent; proximal bracts leaflike, distal ones narrowly linear. Pedicels 1--5 cm, with 2 bracteoles proximally or distally; bracteoles narrowly linear, 1.5--5 mm. Sepals violet-blue, abaxially glabrous or pubescent; lower sepals ca. 1.2 cm; lateral sepals ca. 1.4 cm; upper sepal oblique upward, concave. Petals glabrous; claw sometimes geniculate at apex; lip ca. 4.5 mm, slightly concave; spur incurved, ca. 2.5 mm. Stamens glabrous; filaments 2-denticulate or entire. Carpels 3, glabrous. Follicles ca. 1.1 cm. Seeds 1.5--2 mm. Fl. Aug--Sep.
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