Erect glabrous perennial with stems arising from a crown which surmounts a fleshy tuberous rootstock, the tubers long-fusiform and ± 1–1.5 cm. in diameter; stems moderately branched or occasionally unbranched, fleshy, up to 70 cm. tall.. Leaves spirally arranged, crowded towards the tops of the stems; petiole 0.8–6.2 cm. long, slender, with several ± 1–2.5 cm. long linear-glands (extra-floral nectaries) clustered towards the top; lamina broadly ovate or ovate rhombic, occasionally suborbicular, 3.3–9.1 cm. long, 2.8–6.7 cm. broad; lateral veins (4–)5–7 pairs; margin shallowly crenate-serrate, with a single narrow tooth bent under against, and on each side of, and towards the base of the lamina.. Inflorescence an axillary 2–5-flowered subumbellate raceme borne towards the stem tops; flowers apricot-red with a small purplish blotch towards the base of the lower petal of each lateral united pair.. Peduncle 3.1–5 cm. long, slender, erect or ascending.. Bracts linear-lanceolate, 3–4 mm. long.. Pedicels 1.3–2.2 cm. long, slender, ascending in flower but deflexed in fruit.. Lateral sepals linear-lanceolate, 2–3 mm. long, subacute, reflexed in the upper half.. Lower sepal narrowly navicular, 7–8 mm. long, 1.5–2 mm. deep, abruptly constricted into a 30–34 mm. long curved filiform spur.. Dorsal petal suborbicular to obovate, 11–12 mm. long, 10–11 mm. broad, slightly emarginate, dorsally with a narrow crest.. Lateral united petals 16–18(–24) mm. long, the upper and lower petal of each pair at an angle of about 45° with each other; upper petal of each pair narrow-obovate, 13–14(–16) mm. long, 7–8 mm. broad, entire; lower narrow-obovate, 14–15(–18) mm. long, 6–7(–8) mm. broad, entire.. Ovary glabrous.. Fruit fusiform, 15–16 mm. long, 4.5–5 mm. broad, glabrous.. Fig. 2/8, p. 4.
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