Ptychosperma macarthurii

P. macarthurii is a palm tree. Stems grow in dense clumps or rarely solitary, up to 9 m tall, only 7 cm in diameter, thus appearing bamboo-like. Leaves are up to 3 m or more long, compound. Leaflets are 15-40 on each side, more or less regularly arranged, with margins nearly parallel or tapered at the tip. Inflorescences are up to 20-45 cm long, bearing flowers in groups of three consisting of two male and one female flower. Male flowers with sepals 3, approximately 1.5-2.5 mm long, yellow-green to light green;petals 3, approximately 7 mm long, yellow-green to light green;stamens 23-40 per flower;ovary, style and stigma well developed but the ovules are absent in the male flowers. Female flowers with sepals 3, 2 x 3 mm, cream-green;petals 3, 3-4 x 2-3.5 mm, cream-green;3-6 staminodes present;stigma 0.5 mm long, recurved. Fruits ovoid, 12-16 mm long, red when mature. Seed 9-12 mm long, 5-angled.