Trunk to 25 m tall, to 45 cm diam. Leaves 7–15, to 6 m long, becoming obliquely orientated; leaf sheath green to purple. Pinnae 55–85 each side of rachis, to 105 cm long, dark green adaxially, silver-grey abaxially; ramenta present. Inflorescence to 135 cm long, branched to 4 orders; axes green; rachillae to 85 cm long, erect to semi-pendulous, irregularly flexuose distally. Flowers closely spaced on rachilla; floral bracts raised with sharp margins; perianth white to cream. Staminate flower to 7 mm long; stamens 20–35; filaments curved; pistillode about equal in length to petals. Pistillate flower to 10 mm high. Fruit ovoid to globose, 20–26 mm long, 18–22 mm wide; stigmatic remains apical; mesocarp fibres to 2 mm wide, flat, sparingly branched, interspersed with terete thin fibres, remaining compact in the dried state. Seed subglobose, to 23 mm long, to 18 mm diam.; raphe fibres strongly adherent.
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