Plants to 5 m tall. Rhizome tuberous, diameter unknown. Leaves: petiole provided with a kind of pulvinus partly formed by the thickened lower part of the primary vein at the lower leaf side; sheaths mostly lanuginose, with black margins; lamina narrowly ovate-elliptic to ovate-elliptic, 20–70 by 5–25 cm, base obtuse to acute, apex acute, sometimes shortly acuminate, lower side paler green than the upper side, mostly lanuginose. Inflorescence generally repeatedly branched, with 1- or 2‑flowered cincinni; pedicels 0–1.5 cm long, to 2 cm in fruit; primary bracts 8–20 cm long, acute; branch bracts 2–15 cm long, acute; floral bracts (narrowly) ovate‑triangular to obovate, 0.4–1.5 cm long, acute to obtuse, persistent; bracteoles (narrowly) ovate-triangular, 0.4–2 cm long, acute; rachis, bracts, bracteoles, and sepals glaucous to sometimes lanuginose. Flowers orange to yellow or red, sometimes dotted, 6–10 cm long; floral tube more or less curved around the middle resulting in a horizontally orientated entrance to the flower; sepals green to red, narrowly ovate‑triangular, 1–2.5 by 0.2–0.7 cm, acute; corolla yellow to red, 6–10 cm long, petals erect, narrowly ovate to narrowly triangular, (1.3–)2.5–8 by 0.2–1.3 cm, acute to acuminate; staminode 1, yellow to red, free part narrowly obovate-elliptic, 4–4.5 by 0.4–0.7 cm, erect; stamen yellow to red, free part narrowly triangular-elliptic, 2–3.5 by 0.4–0.8 cm, theca 0.6–2 cm long; style yellow to red, narrowly elliptic to linear, free part 1.5–2.5 by 0.2–0.5 cm. Fruit cream to yellowish brown, covered by red to purplish tubercles, (broadly) ovoid to subglobose or obovoid, 2–4.5(–8.5) by 1.5–2.5(–3.5) cm. Seeds broadly ellipsoid to subglobose, 4–7 by 3–6 mm.