Weakly branched scrambling or ± upright perennial; stems often rooting at the nodes; young stems and shoot apices ± densely pubescent, but glabrescent with age.. Leaves spirally arranged; petiole 0.5–4 cm. long, slender, sparsely pilose, often with a few fine fimbriae towards the top; lamina elliptic to broadly ovate, 1.5–8.5 cm. long, 1–5.5 cm. broad, apex subobtuse rarely shortly acuminate, sparsely to densely pilose on both surfaces with hairs ± 0.5 mm. long; margin crenate to crenate-dentate, the lower 2–3 teeth on each side often very slender; lateral veins 5–8(–9) pairs.. Flowers solitary or in pairs, epedunculate, orange-red.. Bracts inconspicuous, linear-lanceolate, acute.. Pedicels 3.2–6.5 cm. long, slender, sparsely to densely pubescent.. Lateral sepals 2, lanceolate to ovate, 4–6 mm. long, acute, sparsely pilose or glabrous.. Lower sepal 1.4–3.3 cm. long overall, deeply saccate, tapering gradually into a curved or incurved spur, the tip shortly 4–6-lobed, glabrous or finely pilose.. Dorsal petal 7–10 mm. long, 5–6 mm. broad, cucullate, apically produced into a short acute appendage.. Lateral united petals 1.1–1.4 cm. long; upper petal ovate-elliptic, 3–6 mm. long, entire, about half the length of the lower petal; lower petal broadly elliptic to rhomboidiform, 7–10 mm. long.. Ovary glabrous.. Fruit fusiform, 2–2.2 cm. long.
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