Much-branched perennial to 1.5–2 m. tall or more; stems upright to decumbent, glabrous or the youngest parts pilose, but then soon becoming glabrescent.. Leaves in whorls of 3–5, rarely opposite; petiole 7–20 mm. long, slender, with several ± 1 mm. long cilia towards the top and at the base of the lamina; lamina narrowly ovate, lanceolate or elliptic, 3.5–9 cm. long, 1.5–4 cm. broad, apex acute, often shortly acuminate, base shortly cuneate, sparsely pilose above and beneath or glabrous above; lateral veins 5–9 pairs; margin finely serrate-crenate.. Flowers 1 to each leaf-axil, pale mauvy pink, reddish pink, pale purple or reddish violet.. Bracts subulate, 2–4 mm. long, basal, inconspicuous.. Pedicels 4.4–5 cm. long, slender, sparsely pilose or glabrous.. Lateral sepals linear-lanceolate, 4–5 mm. long, acute, sparsely pilose.. Lower sepal navicular, 11–13 mm. long, abruptly constricted into a 3–4.5 cm. long curved filiform spur, sparsely pilose, rarely glabrous.. Dorsal petals suborbicular, 11–14 mm. long, 18–20 mm. broad, dorsally with a narrow crest, the crest usually somewhat pilose towards the base.. Lateral united petals 16–21 mm. long, the upper and lower petals of each pair not usually overlapping; upper petal oblong or obovate, 14–18 mm. long, 8–9 mm. broad, entire or slightly emarginate; lower petal obovate, 15–18 mm. long, 8–11 mm. broad, entire.. Ovary densely pilose in the central region.. Fruit narrow-fusiform, 17 mm. long, 3 mm. broad, sparsely pilose.
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