Picrasma

Family Simaroubaceae. Order Sapindales.

Large trees to shrubs. Buttresses present, or absent; tall. Spines absent. Stilt roots absent. Bark brown, black; not peeling in strips. Slash white, cream, yellow. 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; compound; pinnate; with a terminal leaflet; leaflets opposite; 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 not waxy. Venation trinerved. Secondary veins open; prominent. Smallest veins prominent; 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, or swollen; swollen at one end (usual). Stipules present; free from one another; laterally placed; not encircling the twig; leafy; not fringed; small; not persistent. Domatia absent. Basal glands absent. Hairs on mature leaf absent.

Inflorescences present; axillary; on a branched axis; specialized inflorescence units absent; numerous and persistent inflorescence bracts absent. Flowers at least some flowers unisexual; with male and female flowers on the same plant, or with male and female flowers on different plants; stalked; about 0.5 cm long or across; round; with male or female parts not raised on a column. Hypanthium absent. Disk present; the stamens outside the disk. Perianth present; with distinct calyx and corolla whorls. Sepals 4-5; free, or partially joined; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 4-5; free; not fleshy; deciduous; not stalked; entire. Stamens 4-5; filaments present; free of each other; free of the perianth; all equal in size; isomerous; opposite the sepals (when isomerous). Anthers 2 loculed; attached along the side; not awned; dehiscing by long slits. Ovary superior. Carpels joined; 2-7. Locules 2-7. Styles solitary. Stigmas 2-7 lobed; not distinctive. Fruit drupaceous; fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 2-7 per fruit; less than 5 mm; wingless; uniform in cross-section; aril absent; non-endospermic.

Leaves imparipinnate; leaflets with swollen petiolules; veins prominent on both surfaces; stipules present. Taxon images: picrasma.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.