Small trees to shrubs. Buttresses absent. Spines present, or absent; on branches. Stilt roots absent. Bark gray; not peeling in strips. Exudate absent. Terminal buds enclosed by leaves (cataphylls).
Complex hairs absent. Stinging hairs absent. Mature twig indumentum present, or absent; dense, or sparse.
Leaves spiral; not scale-like; simple, or compound; palmate; all of the same type; not modified into spines; coriaceous to leathery; not gland-dotted; symmetric at the base; dissected, or not dissected; palmately lobed; smooth margined, or with small to large teeth on margin. Epidermis not waxy. Venation palmate. Secondary veins open; prominent, or not prominent, but visible. Smallest veins prominent, or not prominent, but visible; net like, or ladder like. Intramarginal vein absent. Stalk of blade less than a quarter the length of the blade to more than half the length of the blade; not winged; attached to base of leaf blade; swollen; swollen at both ends. Stipules present; joined; laterally placed; not encircling the twig; leafy; not fringed; large; persistent. Domatia absent. Basal glands absent. Hairs on mature leaf present, or absent; dense, or sparse.
Inflorescences present; terminal; on an unbranched axis, or on a branched axis; specialized inflorescence units present; specialized inflorescence units umbels; numerous and persistent inflorescence bracts absent. Flowers bisexual; stalked; about 0.5 cm long or across; round; with male or female parts not raised on a column. Hypanthium absent. Disk present; the stamens outside the disk. Perianth present; with distinct calyx and corolla whorls. Sepals 7-12; fully joined; not joined together and forming a lid; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 7-12; free, or all joined (as a calyptra); not fleshy; deciduous; not stalked; entire. Stamens 7-12; filaments present; free of each other; free of the perianth; all equal in size; isomerous; alternating with the sepals (when isomerous). Anthers 2 loculed; attached along the side; not awned; dehiscing by long slits. Ovary inferior. Carpels joined; 7-12. Locules 7-12. Styles solitary. Stigmas 7-12 lobed; not distinctive. Fruit drupaceous; fleshy, or non-fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 7-12 per fruit; less than 5 mm; wingless; uniform in cross-section; aril absent; endospermic.
Leaves usually palmate; stipules fused, located between the petiole and twig; petals sometimes calyptrate. Taxon images: trevesia.gif
Cite this publication as: Jarvie, J.K. and
Ermayanti (1996 onwards). `Tree Genera of Borneo - Descriptions and
Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993) should also be cited.