Perennial, aromatic herb, decumbent shoots 10-43 cm arising from the base, sparingly branched with underground runners, sometimes thickened to a tuberous organ from which several branches arise. Stems decumbent, often with small branchlets in the axils of the lower leaves. Leaves sub-sessile, occasionally with petioles up to 3 mm long, ovate-cordate, 10-25 x 7-22 mm, serrate, 4-8 teeth. Flowers usually solitary. Very rarely further branches arise from the axils of the bracteoles forming small foliose cymes with up to 4 flowers. Peduncles 5-14 mm long, bibracteolate in the distal half, pedicels 3-9 mm long. Bracteoles resembling the leaves, 5-11 x 3-10 mm. Calyx in flower 7-8 mm long; tube subcampanulate, 4-5 mm long, 15-nerved; calyx teeth 5, subequal, triangular-lanceolate, 3-5 mm long, usually about as long as tube or longer; calyx in fruit 9-10 mm long. Corolla pale to deep cobalt-violet, 20-24 mm long; tube 11-17 mm long, subcylindric at base (up to 4 mm), flattened-campanulate above, 7-9 mm wide at throat, c. 2 mm wide at base, two ridges inside tube on lower side, pubescent and gland-dotted outside, with long thick hairs inside chiefly on the two ridges; upper lip emarginate, slightly reflexed, 2.5 x 7-10 mm, pilose and gland-dotted outside, glabrous in side; lower lip straight with tips curved downwards, 3-lobed, lateral lobes emarginate or entire, 4 x 5-6 mm, sparingly pilose and golden gland-dotted outside, glabrous inside, median lobe emarginate, 4.5 x 6 mm, glabrous outside and inside, several scattered marks in darker violet on upper surface. Upper stamens c. 7 mm long, shortly decurrent, lower pair c. 3 mm long; filaments glabrous; anther cells parallel, c. 1 mm long with 6-14 head-like yellow glands inserted situated ventrally on the connective between the cells. Style 10-13 mm long; stigma lobes acute, unequal, the posticous shorter. Nutlets c. 3.5 x c. 3.5 x 2.5 mm.
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Perennial herb; stems decumbent, glandular-villous, 0.2-0.35 m long. Leaves sessile to subsessile; blade broadly ovate to subrotund, 15-20 x 10-18 mm, glandular-pubescent, apex rounded, base subcordate, margin obscurely few-toothed. Flowers solitary in the axils of the upper leaves; pedicels 10-20 mm long with a pair of leaf-like bracts about the middle. Calyx glandular-hispid, up to 10 mm long, deeply toothed. Corolla mauve, 18-20 mm long; tube campanulate, 14-16 mm long; upper lip 2.5 mm long; lower lip 4 mm long.