Emergent trees to shrubs. Buttresses present, or absent; tall, or short. Spines absent. Stilt roots present, or absent. Bark gray, brown; not peeling in strips. Slash red, gray, brown. Vertical stripes in the inner bark or wood absent. Odor absent. Exudate absent. 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; not gland-dotted; symmetric at the base; not dissected; smooth margined, or wavy margined, or with small to large teeth on margin. Epidermis not waxy. Secondary veins open; not prominent, but visible, or not visible. Smallest veins not prominent, but visible, or not visible; net like. Intramarginal vein present, or absent. Stalk of blade less than a quarter the length of the blade; not winged; attached to base of leaf blade; not swollen, or swollen; swollen at one end. Stipules present; free from one another; laterally placed; not encircling the twig; scale-like; not fringed; small; not persistent. Domatia present, or absent; scattered across lamina. Basal glands absent. Hairs on mature leaf absent.
Inflorescences present; axillary; on a branched axis; specialized inflorescence units present; specialized inflorescence units corymbs; 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 5; partially joined; persistent in fruit; growing slightly after flowering. Epicalyx absent. Petals present; 5; free; fleshy; persistent; not stalked; entire. Stamens 10, or (10-)20(-100) (many); filaments present; free of each other; free of the perianth; all equal in size; diplostemonous to polystemonous. Anthers 2 loculed; attached along the side, or attached by the base; not awned; dehiscing by long slits. Ovary superior. Carpels joined; 5. Locules 5. Styles solitary. Stigmas 1 lobed; not distinctive. Fruit capsular; fleshy, or non-fleshy; not multiple; splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 5-10 per fruit; less than 5 mm; winged, or wingless; uniform in cross-section; aril present, or aril absent; endospermic.
Taxon images: genixona.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.