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Stamens c. 3 mm. long; filaments linear, abruptly dilated, ciliate and obscurely connate at the very base; anthers elliptic–oblong, 1·4–1·6 mm. long, pubescent with up to 0·8–1 mm. long, rather straight hairs on the upper 3/4 of the connective and with shorter hairs towards its base, also a small tuft of hairs c. 0·2 mm. long at the tip.
Leaves sessile or shortly petiolate, up to 35–85 x 2–30 mm., linear to ovate, acute at the apex, attenuate to cuneate at the base, serrate or crenate at the margin, glabrous; venation prominent beneath; petiole up to 12 mm. long, often curved.
Corolla 9–12 mm. long, pale pink, pale purple or mauve, split to the base into 2 lips, the upper 3–lobed but finally disintegrating, the lower divided into 2 free petals; all petals linear, glabrous outside, pubescent inside at the base.
Raceme lax, up to 100 cm. long and c. 20–30–flowered; pedicels up to 3–13 mm. long, shortly crisped pubescent; bracts ±: leaf–like, diminishing in size upwards; bracteoles 1–2 mm. long.
Calyx–lobes narrowly triangular, ± erect or spreading, becoming reflexed in fruit, 2·4–4 mm. long, with 1–3 pairs of teeth at the margin, glabrous or sparsely ciliate.
Capsule ovoid, with 10 distinct nerves connected by weak transversal nerves; inferior part cup–shaped, 2·4–4 mm. long; valves 2·8–3·2 mm. long.
Seeds ± broadly elliptic in outline, ± compressed and irregularly angular, c. 1·2 mm. long, coarsely reticulate, brown.
Stem not or sparsely branched, ribbed, glabrous or very sparsely and finely pubescent in the inflorescence region.
Twining slender herb, up to 2 m. long, from a subglobose or elongated root–tuber, up to 3 cm. long.
Hypanthium broadly obconical, 10–nerved, glabrous or sparsely pubescent at least towards the base.
Ovary semi–inferior; style 1·5–2 mm. long.
