Straggling glabrous perennial 30–40 cm. tall; stems well branched, often rooting at the lower nodes.. Leaves in verticils of 3–5, rarely opposite; petiole 0.9–3.6 cm. long, slender; lamina ovate or lanceolate, (1.4–)2–10.5 cm. long, (1–) 1.5–5.5 cm. broad, apex acute or shortly acuminate, base shortly cuneate; lateral veins 4–7 pairs; margin crenate-denticulate.. Inflorescence 1-flowered; flowers red, the lateral united petals with central yellowish or whitish zones, the spur and dorsal petal sometimes greenish.. Peduncle 2–3.2 cm. long, ± upright.. Bracts 1 to each peduncle, subulate, 3.5–4.5 mm. long.. Pedicels 1.7–2.2 cm. long, slender.. Lateral sepals linear-lanceolate or narrowly-triangular, 4–6 mm. long, acute or shortly acuminate.. Lower sepal narrowly bucciniform, 7–11 mm. long, with a slight constriction in the upper third, but gradually tapering in the distal two-thirds into an incurved spur, 23–29 mm. in length overall, apex rounded.. Dorsal petal 8–10 mm. long, 4–6 mm. broad (not flattened), cucullate, dorsally with a narrow crest terminating in a short acute point.. Lateral united petals 8–11 mm. long, the upper and lower petals subequal in size; upper petal transversely oblong or elliptic, 4.5–6 mm. long, 3–3.5 mm. broad; lower petal oblong, 5–7 mm. long, 2.5–4 mm. broad.. Ovary glabrous.. Fruit narrowly fusiform, 15 mm. long, 2 mm. broad.. Fig. 4/57, p. 8.
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