Trees (not in Victoria) or shrubs. Leaves alternate, simple, margins entire (in Victoria), toothed or lobed, petiolate. Inflorescence an axillary or terminal spike. Flowers actinomorphic, sessile, in pairs subtended by a caducous bract. Tepals white or cream, initially coherent but splitting to the base on maturing, apices recurved; anthers with a distinct free filament; hypogynous glands 4, free, linear; ovary sessile, ovules 2; style filiform, barely dilated at the tip into a definite pollen presenter. Fruit a 2-seeded, leathery, boat-shaped follicle; seeds compressed, with an oblique, membranous terminal wing.
11 species; 8 in eastern Australia, 3 in South America.