Tuberous rooted perennial to 1.25 m. tall, glabrous; stems thin and sappy, rather poorly branched.. Leaves spirally arranged; petiole (1.7–)2–4.8 cm. long, with 1–3 pairs of rounded glands towards the top; lamina ovate to oblong or broadly elliptic, 4.5–11(–12.5) cm. long, (2.7–)3–6(–7) cm. broad, the apex acute or acuminate, the base rounded or shortly cuneate; margin crenate-dentate or crenulate; lateral veins 8–12 pairs.. Inflorescence a 2–5(–6)-flowered raceme; flowers dark red.. Peduncle 7–14(–18) cm. long.. Bracts oblong to oblong-ovate, 6–9 mm. long, acute or shortly acuminate.. Pedicels 17–24 mm. long, slender.. Lateral sepals 4 (2 pairs); upper pair linear-oblong, 8–9 mm. long, 1–2.5 mm. broad, acute; lower pair ovate to ovate– oblong, 7–8 mm. long, 4 mm. broad, subacute or slightly acuminate.. Lower sepal bucciniform, 10–14 mm. long, gradually tapering into a 29–40 mm. long, incurved spur, slightly swollen at the tip.. Dorsal petal ± 10 mm. long and 7 mm. broad, cucullate, scarcely crested.. Lateral united petals ± 17–18 mm. long; upper petal oblong to oblong-ovate, 6–7 mm. long, 3–4 mm. broad; lower petal broadly and rather obliquely oblong or oblong-elliptic, 11–14 mm. long, 8–10 mm. broad.. Ovary glabrous.. Fruit unknown.. Fig. 4/44, p. 8.
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