Xanthophyllum

Family Polygalaceae. Order Polygalales.

Large trees to shrubs. Buttresses present, or absent; short. Spines present, or absent. Stilt roots absent. Bark gray; not peeling in strips. Slash yellow, orange, 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 present, or absent; dense, or sparse.

Leaves spiral, or two-ranked; not scale-like; simple; all of the same type; not modified into spines; coriaceous; not gland-dotted; very asymmetric at the base, or symmetric at the base; not dissected; smooth margined. Epidermis waxy, or not waxy. Venation pinnate. Secondary veins open; prominent, or not prominent, but visible. Smallest veins prominent, or not prominent, but visible; net like, or ladder like. Intramarginal vein present, or absent. 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 present, or absent; pit-like; scattered along midrib, or scattered across lamina. Basal glands present, or absent. Hairs on mature leaf present, or absent; dense, or sparse.

Inflorescences present; terminal, or axillary; on an unbranched axis, or 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 5; free; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 5; free; not fleshy; deciduous; stalked; entire. Stamens (7-)8(-10); filaments present; joined; free of the perianth; all equal in size. Anthers 2 loculed; attached by the base; not awned; dehiscing by long slits. Ovary superior. Carpels joined; 2. Locules 1-2. Styles solitary. Stigmas 2 lobed; distinctive, or not distinctive; head shaped, or disk-like. Fruit berry-like, or drupaceous, or a nut; fleshy, or non-fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 1-100 per fruit (many); less than 5 mm, or about 1 cm long, or much more than 1 cm long; wingless; uniform in cross-section; aril absent; endospermic, or non-endospermic.

Twigs and other young parts very green; leaves distichous and drying yellow; flowers resembling a legume flowers at first glance. Taxon images: genxanth.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.