Rather delicate annual or short-lived perennial; stems thin, decumbent to erect, sparingly branched, usually glabrous, rooting at the lower nodes.. Leaves spirally arranged or occasionally subopposite, pale green, petiolate to subsessile; petiole 2–11 mm. long, slender; lamina elliptic to elliptic-ovate, 1.1–7.5 cm. long, 0.4–3.9 cm. broad, cuneate into the petiole, the apex subacute, sparsely pubescent on both surfaces; lateral veins 3–6 pairs; margin shallowly serrate-crenate.. Flowers axillary, solitary or in fascicles of 2, epedunculate, pale mauvish pink with a whitish spur, the upper petal of each lateral united pair with a conspicuous magenta blotch towards the base.. Bracts subulate, 2–2.5 mm. long, inconspicuous.. Pedicels 14–28 mm. long, slender.. Lateral sepals lanceolate, 2–2.5 mm. long, 1 mm. broad, subacute, sparsely pubescent or glabrous.. Lower sepal narrowly navicular, 5–6 mm. long, 2–2.5 mm. deep, abruptly constricted into a 7–10 mm. long curved filiform spur, glabrous or sparsely pubescent, especially along the keel of the lower sepal.. Dorsal petal ovate, 4–5 mm. long, 5–6 mm. broad, slightly emarginate, dorsally with a narrow crest.. Lateral united petals 8–10 mm. long; upper petal of each pair narrowly oval-falcate, 4.5–6 mm. long, 2–2.5 mm. broad, entire; lower petal narrowly oblong, 5.5–7 mm. long, 0.75–1.25 mm. broad, with a ± 2–2.5 × 1–1.5 mm. oblong lobe distally.. Ovary glabrous.. Fruit narrowly fusiform, 14–17 mm. long, 1.5–2 mm. broad.. Fig. 2/34, p. 4.
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