Small trees to shrubs, or climbers. Buttresses absent. Spines absent. Stilt roots absent. Bark gray; not peeling in strips. Exudate absent. Terminal buds not enclosed by leaves.
Complex hairs present; star-like. Stinging hairs absent. Mature twig indumentum absent.
Leaves opposite, or spiral; not scale-like; simple; all of the same type; not modified into spines; coriaceous, or paper-like; 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. 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 to less than a quarter the length of the blade; not winged; attached to base of leaf blade; not swollen. Stipules absent. Domatia absent. Basal glands absent. Hairs on mature leaf present, or absent; dense, or sparse.
Inflorescences present; 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, or to about 3 cm long or across; with one plane of symmetry; with male or female parts not raised on a column. Hypanthium absent. Disk absent. Perianth present; with distinct calyx and corolla whorls. Sepals 3; partially joined; persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 5; all joined; not fleshy; deciduous; not stalked; lobed. Stamens 5; filaments present; free of each other; joined to the perianth (calyx); all equal in size; isomerous; opposite the sepals (when isomerous). Anthers 2 loculed; attached by the base; not awned; dehiscing by long slits. Ovary partly inferior, or inferior. Carpels joined; 2. Locules 1-2. Styles solitary. Stigmas 1 lobed; distinctive; disk-like. Fruit drupaceous; fleshy, or 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; wingless; uniform in cross-section; aril absent; endospermic.
Leaves entire to toothed, glands on teeth and leaf tip; petals giving a "half corolla" appearance; stigma surrounded by a cup-like structure; calyx persistent in fruit. Taxon images: scaevola.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.