Herb,? annual, 15–30 cm. tall; stems upright to decumbent, rooting at the lower nodes, sparingly branched, finely pubescent when young but gradually glabrescent.. Leaves spirally arranged, dark green above, pale greyish green beneath; petiole 5–12 mm. long, sparsely pubescent; lamina broadly ovate, 1.5–2.8 cm. long, 1.2–2.2 cm. broad, the base rounded to ± truncate, the apex subacute, pubescent on both surfaces; lateral veins 3–4(–5) pairs; margin finely crenulate-serrate.. Flowers axillary, solitary, epedunculate, pale pink.. Bracts linear-lanceolate, ± 2 mm. long, inconspicuous, sparsely pubescent.. Pedicels 2.2–2.8 cm. long, slender, pubescent.. Lateral sepals linear-lanceolate, ± 2 mm. long, acute, pubescent all over.. Lower sepal narrowly and obliquely navicular, ± 5 mm. long, rather abruptly constricted into a 1.1–1.3 cm. long filiform spur, gradually tapering and incurved to the tip, sparsely pubescent overall.. Dorsal petal 5–6 mm. long, 2–3 mm. broad, shallowly cucullate, dorsally with a shallow crest, pubescent towards the base and along the crest.. Lateral united petals 12–14 mm. long, the upper petal of each pair ± one-third the size of the lower; upper petal oblong-elliptical, ± 7 mm. long and 3.5 mm. broad, slightly apiculate; lower petal transversely broadly ovate, ±11 mm. long, and 7.5 mm. broad, with an emargination along the inner margin.. Ovary finely pubescent.. Fruit fusiform, 8 mm. long, pointed at the tip, pubescent.. Fig. 3/32, p. 6.
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