Stem solitary, to 10 m tall, and 5-10 cm in diameter. Leaves 2.5-3.5 m long, with 80-100 pinnae on each side, these inserted in groups and pointing in somewhat different directions, the central ones 40-80 cm long, and 3.0-3.5 cm wide. Inflorescence 75-135 cm long, with 10-30 branches, to 30 cm long. Male flowers ca. 10 mm long. Female flowers 12-13 mm long. Fruit yellow, 6-8 cm long and 3-4 cm in diameter, with the seed triangular in cross-section.