Sterculia

Family Sterculiaceae. Order Malvales.

Large trees to shrubs. Buttresses present; short. Spines absent. Stilt roots present, or absent. Bark not peeling in strips. Vertical stripes in the inner bark or wood absent. Odor absent. Exudate absent. Terminal buds not enclosed by leaves.

Complex hairs present; disk-shaped, or star-like. Stinging hairs absent. Mature twig indumentum present, or absent; dense, or sparse.

Leaves spiral; not scale-like; simple, or compound; palmate; all of the same type; not modified into spines; coriaceous; not gland-dotted; symmetric at the base; dissected, or not dissected; palmately lobed; smooth margined. Epidermis not waxy. Venation pinnate, or trinerved, or palmate. 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 a quarter to one half the length of the blade to more than half the length of the blade; not winged; attached to base of leaf blade; swollen; swollen at one end, or swollen at both ends. Stipules present; free from one another; laterally placed; not encircling the twig; scale-like; not fringed; large, or small; not persistent. Domatia absent. Basal glands absent. Hairs on mature leaf present, or absent; dense, or sparse.

Inflorescences present; terminal, or axillary, or on the trunk or branches; on an unbranched axis, or on a branched axis; specialized inflorescence units absent; numerous and persistent inflorescence bracts absent. Flowers bisexual, or at least some flowers unisexual; with male and female flowers on the same plant; stalked; about 0.5 cm long or across, or to about 3 cm long or across; round; with male or female parts raised on a column; with male and female parts raised on a stalk. 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 absent. Stamens 100 (many); filaments present; joined; free of the perianth; all equal in size; polystemonous. Anthers 2 loculed; dehiscing by long slits. Ovary superior. Carpels joined, or partially joined, by base; 1-5. Locules 1-5. Styles solitary. Stigmas 1 lobed; not distinctive. Fruit capsular; non-fleshy; not multiple; splitting; not enclosed in, or sitting on, fleshy perianth parts; winged (Sterculia laurifolia), or wingless. Seeds 100 per fruit (many); less than 5 mm, or about 1 cm long; wingless; uniform in cross-section; aril absent; endospermic.

Fruits bright red, appearing in 1-5's, splitting and exposing black seeds hanging from the split edges. Taxon images: gensterc.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.