Glabrous perennial herb; stem erect, 0.3–3 m. high.. Leaves petiolate; blade oblong, ovate or suborbicular, up to 18 cm. long, 10 cm. wide, apex obtuse, base cuneate, margins crenate, light green; petiole up to 3 cm. long, flattened and grooved above, slightly broadened at the base.. Inflorescence a densely flowered paniculate cyme up to 30(–70) cm. long; pedicels 1–4 mm. long, conspicuously broadened below the flower, glabrous, rarely sparsely pilose (var. subpilosa Cuf. from Ethiopia).. Calyx-lobes triangular-subulate, 2–8 mm. long, 1–1.5 mm. wide, long-attenuate, connate at the base for 0.1–0.3 mm., glabrous, rarely sparsely pilose (var. subpilosa).. Corolla-tube pale to greenish yellow, limb yellow to dark orange, reddish orange or red; tube 8–12 mm. long; lobes oblong-lanceolate to broadly obovate, 2–5 mm. long, 1.5–4 mm. wide, truncate or retuse, mucronate (mucro 0.2–1 mm. long).. Episepalous stamens with anthers included within the tube by 1.5–2.5 mm., epipetalous stamens with tip of anthers almost attaining the throat of the tube or included with the tube by up to 1 mm.; anthers with apical glands 0.05–0.1 mm. in diameter; anthers of both whorls nearly the same size, broadly oblong, 0.7–0.85 mm. long, 0.5–0.7 mm. wide.. Nectary scales linear-subulate, 1–3.5 mm. long.. Carpels linear-lanceolate, 5–9 mm. long, terminating in styles 1–3.5 mm. long.
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