Borassodendron  

Solitary, dioecious, pleonanthic palm trees. Leaves induplicate, costa palmate; leaf sheath splitting to the base, fibrous along margins, with additional triangular cleft below the petiole; petiole robust, deeply channelled above, margins smooth and very sharp; adaxial hastula well developed, abaxial hastula reduced or absent, blade deeply divided into several folded segments, these further parted into single-folded segments, transverse veinlets conspicuous. Inflorescences interfoliar, dimorphic, enclosed at the base in the prophyll and one to few peduncular bracts, more or less drooping at anthesis. Male inflorescences branched to second order, male rachillae with tight spiral of imbricate bracts, subtending and covering sympodial flower clusters of 2–6 flowers, male flowers exserted one at a time as they pass into anthesis, stamens 6–15, pistillode minute to absent. Female inflorescence spicate or with few branches, with tight spiral of overlapping bracts, each subtending a single female flower, this much larger than male flower and only partly covered by the bracts, staminodes much reduced, gynoecium globose, 3-loculate with sessile stigmas. Fruit large, rounded, usually 3-seeded, rarely with fewer seeds, epicarp smooth, mesocarp fibrous, endocarp around individual pyrenes very thick and grooved. Seed with homogeneous endosperm.

Two species, Peninsular Thailand, Peninsular Malaysia, Borneo. One species in Thailand.