Soft, branched herb up to 0,6 m tall; stems decumbent to ascending, glandular-pilose with long and short hairs having purple sap, giving a purplish colour to the stems. Leaves petiolate; blade thin to thickish and rugose in texture, broadly elliptic, broadly ovate or rarely subrotund, (35-) 40-80 x 30-55 mm, sparingly to freely strigose, under-surface usually suf­fused with purple, with honey-coloured gland-dots, apex acute to obtuse, base attenuate or abruptly cuneate, margin regularly and shallowly crenate-dentate, conspicuously ciliate; petiole 15 — 35 mm long. Inflorescence simple or with a pair of branches near the base, racemes 60—200 mm long; flowers in sessile, usually 3-flowered cymes, forming 4—6-flowered verticils 10—20 mm apart. Calyx 8—10 mm long in fruiting stage, hispid to glandular-puberulous, fringed with multicellular hairs. Corolla with whitish background freely speckled with purple, 8—14 mm long; tube expanding, saccate and slightly deflexed at the base, narrowing slightly towards the throat; upper lip 5—7 mm long; lower lip boat-shaped, 3—6 mm long, horizontal or deflexed. Stamens free, exceeding the lower lip.