Rather robust perennial to 2 m. tall, though generally less; stems often reddish, sparingly branched or simple, glabrous or with a few hairs when young, but then soon glabrescent.. Leaves spirally arranged; petiole 2.3–6.8 cm. long, slender, with a number of 2–4 mm. long stipitate glands (extra-floral nectaries) crowded at the top; lamina narrowly ovate or oblong to oblong-elliptical, (2.5–)5–18.5 cm. long, (2–)2.5– 5.2 cm. broad, the base attenuate, the apex acute to acuminate, sparsely pubescent above but rather densely so beneath, especially along the midrib and lateral veins; margin serrulate or serrulate-denticulate; lateral veins (8–)9–14 pairs.. Inflorescence (1–)2(–3)-flowered, the flowers pink to deep red or vermillion.. Peduncle 3–9 cm. long, slender, glabrous or somewhat pubescent.. Bracts linear-lanceolate, 4–7 mm. long, acute.. Pedicels 2–3.5 cm. long, slender.. Lateral sepals 2, narrowly lanceolate, 4–7 mm. long, acute.. Lower sepal narrowly navicular, 15–19 mm. long, abruptly constricted into a 27–41 mm. long curved filiform spur which is slightly thickened at the tip.. Dorsal petal suborbicular to obcordate, 22–26 mm. long, 26–30 mm. broad, dorsally with a narrow crest terminating in a short acute point.. Lateral united petals (20–)24–30 mm. long; upper petal of each pair suborbicular to obovate, 22–28 mm. long, 14–23 mm. broad, entire or slightly emarginate; lower petal of each pair similar in shape to the upper, 23–28 mm. long, 13–21 mm. broad, entire or slightly emarginate.. Ovary glabrous.. Fruit fusiform, 17–22 mm. long, glabrous.
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