Rhizome oblique, terete, ca. 1.1 cm in diam. Stem 50--100 cm tall, basally densely retrorse and appressed pubescent. Basal leaves 3 or 4, and proximal cauline leaves long petiolate; petiole 14--20(--28) cm, retrorse pubescent; leaf blade reniform, 4.8--9.2 × 7.5--13 cm, both surfaces appressed pubescent, 3-parted; central lobe cuneate-obtrapezoid, 3-fid, margin dentate; lateral lobes flabellate, unequally 2-parted. Inflorescence 20--40 cm, densely flowered; rachis and pedicels densely spreading yellowish pubescent; basal bracts ± 3-sect, to 1.6 cm; lobes lanceolate or oblong to linear-oblong, 6--12 mm. Proximal pedicels to 1--2 cm, others 1.5--5 mm, with 2 bracteoles at base; bracteoles linear, 4--6 mm. Sepals blue or blue-purple, spreading pubescent; lower sepals ca. 9 mm; lateral sepals ca. 1 cm; upper sepal cylindric, 1.3--1.5 cm high, middle ca. 4.5 mm in diam., lower margin erect, 1--1.3 cm. Petals glabrous; limb short, apex rounded; lip linear, conspicuous; spur incurved, 4--5 mm, nearly ecalcarate, or spur short. Stamens glabrous; filaments entire. Carpels 3; ovary sericeous-pubescent. Follicles ca. 1.4 cm, pubescent. Seeds ca. 2 mm. Fl. Aug--Oct. 2n = 32*.
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