Erect, perennial herb, 15-40 cm, with a firm rootstock. Stem angular, glabrous to sparsely pilose. Rosette leaves narrowly spathulate to obovate-lanceolate, tapering towards the base, shallowly crenate-dentate, blunt, 2-5 by 0.5-1 cm; cauline ones erect, narrower, more distinctly sessile and smaller, all pilose. Raceme unbranched, up to c. 10-flowered, rachis 5-10 cm, glabrous. Bracts herbaceous, ovate to elliptic-oblong, resembling the leaves but smaller, 5-15 mm long. Pedicels terete, pilose, 5-8 mm, with two small, linear, hairy bracteoles. Flowers 1.5-2.5 cm long. Calyx lobes oblong, c. 5 by 1.5-2 mm, blunt to broadly triangular at the apex, shallowly crenate, glabrous or pilose. Corolla 0.75-2 cm, slit to the base, lilac or pale purple, purple-veined, inside and on the nerves and margins outside hairy, dorsal lobes connate with the lateral ones for 4-5 mm, lateral lobes connate with the ventral one for 7-9 mm; dorsal lobes narrowly lanceolate, boat-shaped, 9-11 by 2 mm, acute, lateral and ventral lobes about equal, oblong-lanceolate, 6-8 by 1½-2 mm. Filaments 6-8 mm, up to ⅓ free and hairy, anthers from dorsal to ventral 4-2 mm, dorsally hairy, the ventral ones with an apical hair tuft. Ovary 2-4.5 by 2-4 mm, trumpet-shaped to cam-panulate, distinctly ribbed, glabrous to densely hairy; style glabrous. Capsule c. 5 by 4 mm, cupular, campanulate to ovoid, hirsute to pilose. Seeds 0.5 by 0.5 mm, flattened ellipsoid, light brown and smooth.
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