Stoloniferous perennial herb; stems many from the crown, rooting at the nodes, branching, quadrangular, winged, up to c. 2 mm x 2 mm across, up to 480 mm long, erect or decumbent, glabrous or nearly so becoming glandular puberulous on the inflorescence branches. Leaves glabrous, c. 16-30 x 18-25 mm, diminishing in size upwards, ovate to lanceolate, apex subacute, base truncate, margins crenate; petiole up to 4.2 mm, with the uppermost leaves nearly sessile. Flowers one to several in terminal racemes; bracts up to 5.8 x 4.6 mm, cordate to deltoid, cymbiform, apex acute, base cordate with lower lobes toothed; pedicels up to 18 mm, ascending, glandular-puberulous. Calyx reflexed, segments green with narrow hyaline margins, glandular-pilose, minutely serrate; upper segments 4.0 x 2.0 mm, ovate, apex acute; lower segments 4.0 x 1.6 mm, falcate. Corolla tube invaginated, c. 3.0 mm adaxially and c. 1.7 mm abaxially; two lateral spurs c. 6.0-8.6 mm long, directed downwards, tips straight or slightly curved outwards, with dark purple glands inside extending c. 3.6 mm back from the tip and visible on the outside as a dark patch; limb c. 18-28 x 17-24 mm, anticous lobe c. 11-14 x 11-14 mm, broadly ovate, two lateral lobes 6-7 x 7-8 mm, oblong-ovate, two posticous lobes c. 5-6 x 6 mm, oblong-ovate, all lobes rose pink except for a white patch at base of anticous lobe, thinly glandular-pilose outside, anticous lobe with two lateral patches of c. 10-60 dark multicellular gland dots on the inner surface; ‘window’ (translucent depression at base of upper lobes) concave, c. 2.3-2.4 x 3.5-4.3 mm, oval to emarginate, sometimes divided by a central maroon partition, yellow, occasionally with a few maroon spots, bordered with red-maroon. Stamens four, projecting outwards and downwards from the base of the boss produced by the invaginated corolla tube; anticous pair of filaments c. 4.2 mm long, falcate, twisted at the base to bring them into the posticous position; posticous filament (appearing anticous) 3.7 mm long ± straight; all filaments glandular-puberulous, trichomes peltate with translucent stalks and black heads; anthers c. 0.7 mm long, usually cohering strongly; pollen yellow to green. Ovary 1.7 x 1.2 mm, deltoid in outline; ovules 40-50 in each loculus; style 2.8 mm long; stigma capitate minutely cleft, emerging below the anthers. Capsule 0.0-6.5 x 3.0-4.5 mm, urceolate; seeds c. 1.2-1.7 mm long, winged and ribbed.
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