Description from Flora of China
Trees, rarely shrubs, evergreen or rarely deciduous. Bark red, gray, or brown. Leaves simple, alternate, to 50 cm, with or without persistent or deciduous amplexicaul wings. Flowers solitary or in few- to many-flowered racemes, large. Sepals (4 or)5(-18), fleshy, often accrescent. Petals (4 or)5(-7) or absent. Stamens very numerous, inner often with longer anthers than outer; anthers dehiscing by 2 (sub)apical pores or less often by 2 longitudinal slits, connective narrow, linear. Carpels partially joined, 4-20, adnate to conical receptacle; ovules 1 to numerous per carpel. Fruit enclosed by enlarged sepals, carpels dehiscing along ventral suture or indehiscent. Seeds usually only 1 or few per carpel, arillate or not.
About 65 species: Madagascar to Fiji, most species in tropical Asia; three species in China.