Erect tree to 20 m high; prop roots basal. Leaves to 3 (–4) m long and 10 cm wide, erect-arching, attenuate; marginal prickles antrorse, 3–3.5 mm long, 4–10 mm apart. Staminate inflorescence large, pendent, spicate-racemose; spikes 7–11, c. 9–20 cm long; staminate phalanges with c. 15–23 stamens, subumbellate, 12–18 mm long. Pistillate head sometimes 2 or 3 together; peduncle c. 35–50 cm long, c. 6 cm thick; head of 90–110 carpellate phalanges. Polydrupe of 5–12 carpels, compressed, obovoid or subcuneate, convex or subtruncate, 7.5–8.6 cm long, 4.5–7 cm wide, angulate, with evident apical, and sometimes lateral sutures, but lateral faces mostly smooth; stigma erect or oblique, c. 3–3.5 mm long.
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