Plants to 5 m tall. Rhizome tuberous, diameter unknown. Leaves: sheaths mostly densely lanuginose; lamina pluriplicate, narrowly ovate, (20–)40–80 by 15–45 cm, base cuneate, apex acute, sometimes shortly acuminate, lower side often densely lanuginose. Inflorescence branched, with 1- (or 2-)flowered cincinni; pedicels 0.5–2 cm long, to 3 cm in fruit, densely tuberculate just below the ovary; primary bracts 20–40 cm long, acute; branch bracts 3–11 cm long, acute to obtuse; floral bracts (narrowly) ovatetriangular to broadly obovate, 0.3–1.5 cm long, obtuse to acute, persistent; bracteoles linear, 1–4 cm long, acute, far exceeding the floral bracts; bracts, bracteoles, and sepals glaucous, sometimes lanuginose. Flowers carmine-red to purple, pendent, 10–14 cm long; sepals deep red to dark purple, narrowly ovate-triangular, 2.3–4.5 by 0.4–0.8 cm, acuminate to acute; corolla carmine-red to purple, 8–12.5 cm long, petals erect, narrowly ovate-triangular, 3.5–7 by 0.6–1.5 cm, acute; staminodes 4, carmine-red to purple, inner ones sometimes spotted with white, 11–14 cm long, free part narrowly obovate to narrowly elliptic, 4.5–6 by 1–2.5 cm, apically more or less patent; stamen carmine-red to purple, free part narrowly elliptic, 3–4.3 by 0.5–1 cm, theca 1–1.5 cm long; style carmine-red to purple, free part narrowly obovate to narrowly elliptic, 3–4 by c. 0.5 cm. Fruit yellowish green, covered by dark purplish tubercles, ellipsoid, 5.5–10 by 3.7–4.5 cm. Seeds broadly ellipsoid, 8–10 by 5–8 mm.