Perennial herb or soft shrub; stems erect, up to 2 m tall or procumbent up to 2 m long, usually purplish, glandular-pubescent. Leaves petiolate; blade thin to somewhat thick-textured, broadly elliptic or broadly ovate to subrotund, 40-150 x 30-100 mm, finely to coarsely pubescent, under-surface with numerous red to brownish gland-dots, apex obtuse to rounded, base subcordate or truncate to attenuate or decurrent on the petiole, margin regularly crenate; petiole 20-80 mm long. Inflorescence usually paniculate, 100-250 mm long; flowers in sessile 3-flowered cymes, forming usually 6-flowered verticils 5-12 mm apart. Calyx 6-8 mm long in fruit, glandular-hispid with scattered long hairs. Corolla white, scarcely or noticeably flushed with pinkish mauve, 5.5-8 mm long; tube slightly deflexed, expanding and saccate at the base, narrowing slightly towards the throat; upper lip 2.5-4 mm long; lower lip boat-shaped 2.5-4 mm long. Stamens free, up to 6 mm long.
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