Caudex obconical, ca. 4 cm, ca. 1 cm in diam. Stem 85--110 cm, simple, retrorse or slightly spreading pubescent, basally usually becoming glabrous, with leaves equally arranged along stem. Proximal cauline leaves withered at anthesis, middle ones slightly long petiolate; petiole 2--5 cm; leaf blade pentagonal, 5.5--7.5 × ca. 9 cm, both surfaces glabrous, 3-parted; central lobe usually broadly rhombic or rhombic; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence ± narrowly long, 15--37 × 5--10 cm, 8--35-flowered; rachis retrorse or intermixed with spreading yellowish hairs; bracts leaflike. Pedicels 2.5--7 cm, densely spreading yellowish pubescent, with 2 bracteoles proximal to distal; bracteoles usually linear, 2.5--4 mm, sometimes bracteoles of lowermost pedicels larger, 3-fid. Sepals purple, abaxially sparsely pubescent; lower sepals ca. 1.5 cm; lateral sepals ca. 1.6 cm; upper sepal galeate, shortly clawed, ca. 2 cm high, 1.5--1.8 cm from base to beak. Petals glabrous or nearly so; lip ca. 4.5 mm; spur incurved, ca. 2 mm. Stamens glabrous; filaments entire or 2-denticulate. Carpels 4 or 5, ± densely pubescent. Follicles 1--1.8 cm. Seeds obovate. Fl. Aug--Sep.
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