Stems ascending proximally, erect distally, branched, to 1 m, pubescent with multicellular hairs. Leaf sheaths 1--2 cm, densely multicellular pubescent; leaf blade elliptic, 15--30 × 4--7 cm, sparsely hispidulous, base cuneate-attenuate into short petiole, apex acuminate. Inflorescence sparsely pubescent with glandular, multicellular hairs; peduncle 8--11 cm; cincinni 2.5--5 cm. Pedicels 3--5 mm at anthesis, sparsely pubescent with glandular, multicellular hairs. Posterior sepal ovate-orbicular, ca. 7 mm; other 2 sepals oblong, shallowly boat-shaped, ca. 5 mm, sparsely pubescent with glandular, multicellular hairs along veins. Posterior 2 petals orbicular, anterior one obovate, all blue-purple or pale blue, ca. 8 mm, shortly clawed. Filaments glabrous, those of 2 fertile stamens (inserted opposite sepals) to 15 mm, others shorter; anthers oblong. Ovary ellipsoid, trigonous. Style to 15 mm. Capsule 13--15 × 3--4 mm; pericarp grayish yellow, ± shiny when mature. Seeds 4 or 5 per valve, pale gray, 1.5--2.5 mm. Fl. Jul--Aug.
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