Aquilaria

Family Thymelaeaceae. Order Myrtales.

Large trees to shrubs. Buttresses absent. Spines absent. Stilt roots absent. Bark white, cream; peeling in strips. Slash white, cream, gray, 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; simple; all of the same type; not modified into spines; coriaceous; not gland-dotted; symmetric at the base; not dissected; smooth margined, or wavy margined. Epidermis not waxy. Venation pinnate. Secondary veins open, or closed; prominent, or not prominent, but visible. Smallest veins prominent to not visible; ladder like. Intramarginal vein absent. Stalk of blade 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 absent.

Inflorescences present; terminal, or axillary; on a branched axis; specialized inflorescence units present; specialized inflorescence units umbels; numerous and persistent inflorescence bracts absent. Flowers bisexual; stalked; about 0.5 cm long or across, or to about 3 cm long or across; round; with male or female parts not raised on a column. Hypanthium present. Disk absent. Perianth present; with distinct calyx and corolla whorls. Sepals 4-6; partially joined; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 8, or 10, or 12; free, or all joined; not fleshy; deciduous; not stalked; entire. Stamens 8, or 10, or 12; filaments present; free of each other; joined to the perianth; all equal in size; isomerous; opposite the sepals (when isomerous). Anthers 2 loculed; attached along the side; not awned; dehiscing by short slits, or dehiscing by long slits. Ovary superior. Carpels joined; 2. Locules 2. Styles absent. Stigmas 1 lobed; distinctive; head shaped, or disk-like. Fruit capsular; non-fleshy; not multiple; splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 1-2 per fruit; less than 5 mm, or about 1 cm long; wingless; uniform in cross-section; aril absent; non-endospermic.

Bark pale; leaves with closely set parallel veins. Taxon images: genaquil.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.