Habit: solitary, erect, 2-3 m tall. Stem: 1-2 cm diam., green, densely and minutely white-spotted, conspicuously ringed, internodes 10 cm long or more. Leaves: 3-5, ascending to spreading, pinnate; sheath to 45 cm long, long-open, distinctly white-spotted; petiole 50-75 cm long, 7-9 mm thick, distinctly white-spotted; rachis to 70 cm long, green below but distinctly white-spotted; pinnae 10 on each side of rachis, middle ones largest, to 50 x 9 cm, linear-lanceolate, not sigmoid, attenuately long-acuminate with nearly straight upper margin, falcate, regularly disposed, mostly alternate, thin, gradually narrowed basally to 3-3.5 cm wide on larger pinnae, green, concolorous, 5 primary nerves, keeled above, yellowish, shining and prominent below, 1-3 secondaries between primaries, shining below, not keeled above, tertiaries fine and numerous, pinnae only slightly decreasing in size toward apex and base of blade. Inflorescences: infrafoliar, erect-spreading; peduncles 25-65 cm long, stout, 2 cm wide at base, 2-4 mm thick at apex in fruit; bracts 5-6, prophyll to 5 cm long, others to 45 cm long, 6-12 mm broad, tubular, acute, oblique apically, striate-nerved, distinctly white-spotted; rachises to 15 cm long, green in flower, orange in fruit. Staminate with 9-12 rachillae, these 15-25 cm long, green, pendulous. Pistillate with 3-12 rachillae, these 15-27 cm long, spreading, becoming orange, thickened, and pendulous in fruit. Flowers: Staminate in moderately dense spirals, 3 mm high, green, superficial; calyx 1mm high, lobed, sepals connate in basal 1/2; petals valvate, free apically; stamens with filaments rather short, anthers elongate and generally bifid apically; pistillode columnar, ± thickened, 3-angled and truncate apically. Pistillate in rather dense spirals, superficial; calyx 1 mm high, lobed; petals rather strongly imbricate, acute; staminodes lacking; pistil ovoid, stigma lobes sessile. Fruits: 8-9 mm long, obovoid, black; seeds globose; abortive carpels adherent to fruit.