Hibiscus

Family Malvaceae. Order Malvales.

Small trees to shrubs. Buttresses absent. Spines present, or absent; on trunk, or on branches. Stilt roots absent. Bark gray, brown; not peeling in strips. 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; 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, or with small to large teeth on margin. Epidermis waxy, or not waxy. Venation palmate. Secondary veins closed; prominent. Smallest veins prominent, or not prominent, but visible; net like, or ladder like. Intramarginal vein 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; not swollen, or swollen; swollen at one end. Stipules present; free from one another; laterally placed; not encircling the twig; scale-like; not fringed; large; not persistent, or persistent. Domatia absent. Basal glands absent. Hairs on mature leaf present, or absent; dense, or sparse.

Inflorescences present, or represented by solitary flowers only; axillary; the flowers from a single point on the stem; specialized inflorescence units absent; numerous and persistent inflorescence bracts absent. Flowers bisexual; stalked; to about 3 cm long or across to more than 10 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; persistent in fruit; not growing any further after flowering. Epicalyx present. Petals present; 5; all joined (base); not fleshy; deciduous; not stalked; entire. Stamens 100 (many); filaments present; joined (tube); joined to the perianth (base); all equal in size, or of different sizes; polystemonous. Anthers 1 loculed; attached along the side; not awned; dehiscing by long slits. Ovary superior. Carpels joined; 5. Locules 5-10 (usually 5, rarely 10). Styles solitary. Stigmas 5 lobed; distinctive; disk-like. Fruit capsular; non-fleshy; not multiple; splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 3-100 per fruit (many); barely visible to less than 5 mm; wingless; uniform in cross-section; aril absent; endospermic.

Flowers large and showy; stamens joined in a tube; style with five prominent stigmas. Taxon images: hibiscus.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.