Plectocomia
Moderate to robust solitary or clustering, high-climbing, dioecious hapaxanthic rattans. Leaf sheath without knee, usually armed with partial whorls of spines and indumentum; ocrea inconspicuous. Leaf frequently very robust terminating in a long cirrus; petiole present or absent; leaflets numerous, usually irregularly arranged, grouped and fanned within the groups, often discolorous. Male and female inflorescences superficially similar, produced simultaneously from the topmost nodes; primary axes held ± horizontally, stiff; secondary axes limply pendulous, bearing close imbricate distichous bracts, each one subtending and ± hiding a short branch bearing the flowers. Male flowers with calyx short, terminating in 3 teeth; corolla with 3 petals free almost to the base; stamens 6, briefly epipetalous; pistillode minute; female flower with calyx terminating in 3 lobes; corolla with 3 petals free almost to the base; pistil with fimbriate scaly ovary and 3 stigmas. Fruit 1-seeded, covered in fimbriate or smooth margined scales, the scale tips often reflexed; mesocarp quite thick. Seed with thin sarcotesta; endosperm homogeneous; embryo basal. Seedling leaf lanceolate, undivided; second seedling leaf bifid.
Sixteen species in E. Himalaya to Hainan and Malesia. Three species in Thailand.