Large trees to small trees. Buttresses present, or absent; short. Spines absent. Stilt roots absent. Bark gray; not peeling in strips. Slash cream, brown. Vertical stripes in the inner bark or wood absent. Odor absent. Exudate present; white; spotty; not blackening on exposure to air. Terminal buds not enclosed by leaves.
Complex hairs absent. Stinging hairs absent. Mature twig indumentum absent.
Leaves spiral; not scale-like; simple; all of the same type; not modified into spines; coriaceous to leathery; not gland-dotted; symmetric at the base; not dissected; smooth margined. Epidermis not waxy. Venation trinerved. Secondary veins open; prominent. Smallest veins prominent, or not prominent, but visible; net like, or ladder like. Intramarginal vein absent. Stalk of blade a quarter to one half 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; free from one another; laterally placed; not encircling the twig; leafy; not fringed; large; not persistent. Domatia absent. Basal glands absent. Hairs on mature leaf absent.
Inflorescences present; axillary; on an unbranched axis; specialized inflorescence units absent; numerous and persistent inflorescence bracts absent. Flowers at least some flowers unisexual; with male and female flowers on the same plant; stalked; about 0.5 cm long or across; round; with male or female parts not raised on a column. Hypanthium absent. Disk absent. Perianth present; with distinct calyx and corolla whorls. Sepals 3(-4); partially joined; persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals absent. Stamens 5-6; filaments present, or filaments absent; free of each other; free of the perianth; all equal in size; diplostemonous. Anthers 2 loculed; attached by the base; not awned; dehiscing by long slits. Ovary superior. Carpels joined; 3(-4). Locules 3. Styles free; 3. Stigmas 1 lobed; not distinctive. Fruit capsular; fleshy; not multiple; splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 6 per fruit; less than 5 mm; wingless; uniform in cross-section; aril absent; endospermic.
Leaves with long petioles and drying bright yellow; inflorescences stout and axillary; sepals 3. Taxon images: ashtonia.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.