Annual or short-lived perennial to 30–40 cm. tall; stems erect to decumbent, simple or moderately branched, often rooting at the lower nodes, glabrous or finely pubescent, but becoming glabrescent below.. Leaves spirally arranged or occasionally subopposite; petiole 1–3 cm. long, slender, glabrous or finely pubescent; lamina ovate to ovate-rhombic or ovate-elliptic, 1.2–5.3(–7) cm. long, 1.4–3.5(–4) cm. broad, acute to shortly acuminate, the base shortly cuneate, glabrous or finely pubescent above and beneath; lateral veins (3–)4–6 pairs; margin crenate to crenate-serrate.. Inflorescence 1(2–3)-flowered, the flowers violet, pink or purplish, the lateral united petals with a violet, sometimes yellow, spot towards the base.. Peduncle 1.8–2.2(–4) cm. long, slender, usually finely pubescent.. Bracts linear-lanceolate, 2–4 mm. long, acute, solitary or as many as the number of flowers to each peduncle.. Pedicels 11–17 mm. long.. Lateral sepals linear-lanceolate, 2.5–3.5 mm. long, subacute, glabrous.. Lower sepal narrowly navicular, 6–10 mm. long, 2.5–3.5 mm. deep, abruptly constricted into a 12–36 mm. long curved filiform spur.. Dorsal petal suborbicular, 8–11 mm. long, 10–12 mm. broad, emarginate, dorsally with a narrow crest terminating in a short acute point, glabrous or with a few hairs along the crest, especially towards the base.. Lateral united petals 9–14 mm. long, the lower petal of each pair two-thirds the size of the upper; upper petal oblong, 8–11 mm. long, 4–7 mm. broad, ± emarginate; lower petal narrowly oblong-elliptic, 7–10 mm. long, 2.5–5 mm. broad, obtuse.. Ovary glabrous.. Fruit narrowly fusiform, 12–15 mm. long, 2–3 mm. broad, Fig. 2/10, p. 4.
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