Large trees to small trees. Buttresses present, or absent; short. Spines absent. Stilt roots absent. Bark gray, brown; not peeling in strips. Slash orange, red, 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; compound; bipinnate; without a terminal leaflet; leaflets alternate; all of the same type; not modified into spines; coriaceous; not gland-dotted; very asymmetric at the base; not dissected; smooth margined. Epidermis waxy, or not waxy. Venation pinnate. Secondary veins open; not prominent, but visible, or not visible. Smallest veins not prominent, but visible, or not visible; net like. Intramarginal vein present. Stalk of blade absent. 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; sparse.
Inflorescences present; axillary; on an unbranched axis, or on a branched axis; specialized inflorescence units present, or absent; specialized inflorescence units umbels; numerous and persistent inflorescence bracts absent. Flowers bisexual; not stalked, or stalked; about 0.5 cm long or across to to about 3 cm long or across; round; with male or female parts not raised on a column. Hypanthium absent. Disk present, or absent; the stamens outside the disk. Perianth present; with distinct calyx and corolla whorls. Sepals 5; partially joined; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 5; all joined; not fleshy; deciduous; not stalked; entire. Stamens 100 (many); filaments present; joined; joined to the perianth (base); all equal in size; polystemonous. Anthers 2 loculed; attached along the side; not awned; dehiscing by short slits, or dehiscing by long slits. Ovary superior. Carpels solitary; 1. Locules 1. Styles solitary. Stigmas 1 lobed; not distinctive. Fruit legume-like; non-fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 100 per fruit (many); less than 5 mm to much more than 1 cm long; wingless; uniform in cross-section; aril absent; non-endospermic.
Bi-paripinnate leaves; leaflets alternate; fruits indehiscent and very hard. Taxon images: serianth.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.