Low scrambling or ± erect perennial up to 1.5 m. tall, but usually less; stems moderately to much branched, often rooting at the lower nodes, densely pubescent to subglabrous towards the apex, glabrescent below, reddish or green.. Leaves spirally arranged, deep green above, greyish green beneath; petiole (0.7–)1–4 cm. long, pubescent or glabrous; lamina ovate, ovate-oblong or elliptic, 1.7–11 cm. long, 1.3–6.2 cm. broad, the apex acute or shortly acuminate, sparsely to moderately pubescent on both surfaces, more densely so on the younger leaves; lateral veins (3–)4–8 pairs; margin serrate to crenate or crenate-dentate, usually with a few 1–2 mm. long fimbriae towards the base.. Flowers axillary, solitary or in pairs but usually only one developing at a time, epedunculate, pale to deep pink or mauvish with a dark blotch on the upper petal of each lateral united pair.. Bracts linear-lanceolate, 2–3 mm. long, acute, inconspicuous.. Pedicels 2.5–3.8 cm. long, slender, pubescent or glabrescent.. Lateral sepals ovate-oblong or linear-lanceolate, 3–8 mm. long, acute, generally pubescent.. Lower sepal shallowly and obliquely navicular, 5–11 mm. long, abruptly constricted into a 19–28 mm. long curved filiform spur, pubescent, especially along the keel of the lower sepal, sometimes glabrescent.. Dorsal petal obovate, 7–14 mm. long, 11–18 mm. broad, dorsally with a shallow crest terminating in a short acute point.. Lateral united petals 16–28 mm. long; upper petal of each pair elliptic-oblong to suborbicular, 10–15 mm. long, 5.5–12 mm. broad, often slightly emarginate or apiculate; lower petal obliquely oblong or semi-elliptic, 12–22 mm. long, 6–11 mm. broad, with an emargination along the outer margin, the central vein terminating along the inner margin well below the tip of the petal.. Ovary glabrous.. Fruit fusiform, 12–16 mm. long, 3–4 mm. broad, glabrous.
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