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Small trees or shrubs, monoecious. Leaves paripinnate (towards the inflorescence sometimes ternate to 1-foliolate), up to 5-jugate; Inflorescences terminal and sometimes in the upper leaf-axils, paniculate. Flowers regular or nearly so. Sepals 5, free, imbricate, margin in Malesian species petaloid, outer 2 smaller. Petals 5 (in one Australian species 4), imbricate, (sub)equal, slightly longer than the calyx, clawed, outside variably pilose, inside above the claw provided with a small, long-hairy scale. Stamens 8, free, all about equal, not exserted; Ovary triangular, 3-celled; Ovules 1 per cell, anatropous, apotropous, angular, attached about halfway the cell, sessile on a protuberance of the placenta. Fruits like 3-winged Acer-fruits (often, however, 1 or 2 cells abortive), breaking up to samarae with a dorsal, straight to curved, oblique wing, glabrous or tomentose. Seeds without aril, rootlet in a pocket.


Asia-Tropical: Lesser Sunda Is. present, N and E Australia present, S Africa present, SE New Guinea present
12 species: 9 in N and E Australia, of which one also in the Lesser Sunda Islands; 1 in SE New Guinea; 2 species in S Africa.


1. The uppermost parts of the inflorescences are double bostryxes.
2. The genus seems to be closest to the Central American genus Thouinidium Sm.
3. Both Malesian species belong to sect. Atalaya (= Euatalaya Radlk.).


S.T. Reynolds 1981 – In: Austrobaileya: 398
Radlk. 1932 – In: Engl., Pflanzenr. 98: 605
Blume 1847 – In: Rumphia: 186