Large trees to shrubs. Buttresses present, or absent; tall, or short. Spines absent. Stilt roots absent. Bark gray, brown; not peeling in strips. Slash gray. Vertical stripes in the inner bark or wood present, or absent. Odor aromatic. Exudate present; red; flowing, or spotty; not blackening on exposure to air. Terminal buds not enclosed by leaves.
Complex hairs absent. Stinging hairs absent. Mature twig indumentum present, or absent; sparse.
Leaves spiral; not scale-like; simple, or compound; pinnate; with a terminal leaflet; leaflets opposite, or leaflets alternate; all of the same type; not modified into spines; coriaceous; not gland-dotted; symmetric at the base; not dissected; smooth margined. Epidermis not waxy. Venation pinnate. Secondary veins open; prominent, or not prominent, but visible. Smallest veins prominent, or not prominent, but 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; 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 absent. Basal glands absent. Hairs on mature leaf present, or absent; dense, or sparse.
Inflorescences present; terminal, or axillary; on a branched axis; specialized inflorescence units absent; numerous and persistent inflorescence bracts absent. Flowers bisexual; stalked; about 0.5 cm long or across; with one plane of symmetry; with male or female parts raised on a column, or not raised on a column; with the female parts of the flower raised on a stalk. Hypanthium present. Disk absent. Perianth present; with distinct calyx and corolla whorls. Sepals 3, or 5; free; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals absent. Stamens 2, or 6; filaments present; free of each other; free of the perianth; all equal in size; anisomerous, or diplostemonous. Anthers 2 loculed; attached by the base; not awned; dehiscing by short slits. Ovary superior. Carpels solitary; 1. Locules 1. Styles solitary. Stigmas 1 lobed; not distinctive. Fruit a nut, or legume-like; non-fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 1-2 per fruit; less than 5 mm to about 1 cm long; wingless; uniform in cross-section; aril absent; endospermic.
Buttresses often steep; bark smooth, brown but often lichen patched; red sap from slash; petals absent; stamens 2; pod oblong, indehiscent, velvety; seed single and covered by pith like edible pulp. Taxon images: dialium.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.