Perennial herb to 1.5 m. tall, though often less; stems moderately branched, becoming leafless and somewhat woody below, glabrous or pubescent on the youngest parts.. Leaves spirally arranged, ± opposite or in verticils of 3–7; petiole 1–6(–8) cm. long, rather slender, usually glabrous, sometimes with a few, ± 1 mm. diameter, darkish glands towards the top; lamina ovate, lanceolate or oblanceolate, (5–)8–15.5 cm. long, (2.5–)4–7.5 cm. broad, the base cuneate, the apex acute to shortly acuminate, glabrous or sparsely pubescent on both surfaces; lateral veins 6–11 pairs; margin finely crenate or crenate-serrate.. Flowers solitary, axillary, epedunculate, pink or mauvish, often with a white central zone.. Bracts subulate, 2–4 mm. long, inconspicuous.. Pedicels 6.6–9.5 cm. long, glabrous or sparsely pubescent.. Lateral sepals 2, linear-lanceolate, 6–8 mm. long, acute.. Lower sepal narrowly and obliquely navicular, 11–19 mm. long, abruptly constricted into a 4–5.1 cm. long curved filiform spur, somewhat swollen at the tip, glabrous or sparsely pubescent throughout.. Dorsal petal suborbicuar, 17–19 mm. long, 22–23 mm. broad, emarginate, dorsally with a narrow crest.. Lateral united petals 20–25 mm. long; upper petal of each pair oblong or ± oblanceolate, 17–25 mm. long, 8–13 mm. broad, entire or slightly emarginate; lower petal of each pair transversely oblong or obovate, 20–25 mm. long, 10–13 mm. broad, distally drawn out into a 5–8 × 2.5–5 mm. oblong or ± triangular appendage.. Ovary glabrous.. Fruit fusiform, ± 19 mm. long, 6 mm. broad, glabrous.
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