Small to medium-sized ventricose palm growing in 0.5-2.5 m deep water. TRUNK 2.5-8 m, ventricose with base (at water level) to 50 cm across, (above water) 30-40 cm diam., near the crown c. 11 cm across, internodes here 0.5 cm, nodal scars 0.5 cm; bark pale brown, soft, with internodes 1-2 cm; wood soft, cream-coloured, fibrous, without hard fibres. LEAVES 14-16, porrect to spreading, arching, held on edge in distal half, with stiff or arching leaflets; sheath 36-41 x 13-20 cm, adaxially orange, abaxially proximally orange, distally green, with thin grey tomentum; fibres few; petiole 15-19 cm long, proximally 3.5-5 x 1.5 across, distally 2.2-2.3 x 0.5-0.6 cm across, glabrous, keeled; rachis 1.3-1.8 m, in mid-leaf 1-1.5 cm across, with little abaxial tomentum; leaflets in one plane, stiff, 59-63 on each side of the rachis, the proximal 36-47 x 0.5-1.5 cm, median 42-53 x 1.6-2.4 cm (interval 2-2.5 cm), distal 10-30 x 0.4-1.3 cm, ramenta none or few, large, basal on midrib and outer main veins, main veins 4. STAMINATE INFLORESCENCE multiple in 5s, the individual inflorescences to 115 cm, branched to 1 order, pendulous in later stage; peduncle 36-38 cm, proximally c. 1 cm across, distally 0.6-0.7 cm across; prophyll 29-30 cm; peduncular bracts 38 cm, 64 cm (inserted at c. 2 cm from the base of the peduncle), 84 cm (inserted at c. 5 cm), 80 cm (inserted at c. 10 cm); rachis about 54 cm, with many dense rachillae; rachillae 7-24 cm, 1-1.5 mm across; flower scars distant. STAMINATE FLOWERS unknown. PISTILLATE INFLORESCENCE solitary, spreading, 105-125 cm, branched to 1 order, the axes green; peduncle 48-52 cm, proximally 3-5 x 2-2.5 cm, distally 2-3 x 1.3-2 cm; prophyll c. 10 x 4 cm; peduncular bracts 20-24 cm (inserted at 0 -2.5 cm from the base of the peduncle), 49-52 cm (inserted at 3-3.5 cm), 82-83 cm (inserted at 4-9 cm), 100-103 cm (inserted at 10-24 cm); rachis 39-55 cm, with 58-68 branches; rachillae 9-42 cm, the proximal spreading, the distal porrect, the base proximally flat, 0.6-1.5 x 1 cm, in fruit 3 -3.5 mm across; pedicels c. 0.5 mm. PISTILLATE FLOWERS with the calyx connate for 1 mm, 1.5 mm wide, free lobes 1.7-2.6 x 1.6-2 mm, ovate, acute; petals in fruit only present as fibre remnants, c. 2.5 mm long. FRUIT orange, 17-23 x 14-19 mm, one-seeded; stigmatic remnants subapical to lateral. SEED brown, 10-14 mm across, hard, seedcoat black, 0.2 mm thick. SEEDLING with 3-4 scale leaves, the first small, the second, third and fourth to 9 cm long and with curving tips; eophyll pinnate.