Cerbera

Family Apocynaceae. Order Gentianales.

Emergent trees to shrubs. Buttresses absent. Spines absent. Stilt roots absent. Bark brown; not peeling in strips. Slash yellow. Vertical stripes in the inner bark or wood absent. Odor absent. Exudate present; white; flowing; not blackening on exposure to air. Terminal buds not enclosed by leaves.

Complex hairs absent. Stinging hairs absent. Mature twig indumentum absent.

Leaves spiral (yet crowded at tips of branches); 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. Epidermis not waxy. Venation pinnate. Secondary veins open; prominent to not prominent, but visible. Smallest veins not prominent, but visible to not visible; net like. Intramarginal vein present. Stalk of blade less than a quarter the length of the blade to a quarter to one half 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 absent.

Inflorescences present; terminal; on a branched axis; specialized inflorescence units absent; numerous and persistent inflorescence bracts absent. Flowers bisexual; 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 absent. 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 5; filaments absent; joined to the perianth; all equal in size; isomerous; opposite the sepals (when isomerous). Anthers 2 loculed; not awned; dehiscing by long slits. Ovary superior. Carpels partially joined, by styles; 2. Locules 1. Styles solitary. Stigmas 2 lobed; distinctive; head shaped. Fruit drupaceous; non-fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 1-2 per fruit; about 1 cm long to much more than 1 cm long; wingless; uniform in cross-section; aril absent; endospermic.

Copius white latex from slash; leaves spiral, clustered at branch ends; fruit drupaceous, 1-2 seeded. Taxon images: cerbera.gif


Cite this publication as: Jarvie, J.K. and Ermayanti (1996 onwards). `Tree Genera of Borneo - Descriptions and Illustrations' URL http://django.harvard.edu/users/jjarvie/Borneo.htm/.
Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993) should also be cited.