Prunus

Family Rosaceae. Order Rosales.

Large trees to shrubs. Buttresses absent. Spines present, or absent; on branches. Stilt roots absent. Bark brown; not peeling in strips. Slash red, brown. Vertical stripes in the inner bark or wood absent. Odor almond. 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; not scale-like; simple; all of the same type; not modified into spines; coriaceous; gland-dotted, or not gland-dotted; symmetric at the base; not dissected; smooth margined, or with small to large teeth on margin. Epidermis waxy, or not waxy. Venation pinnate. Secondary veins open; prominent, or not prominent, but visible. Smallest veins not prominent, but visible, or not visible; net like, or ladder like. Intramarginal vein present, or absent. Stalk of blade less than a quarter the length of the blade; not winged; attached to base of leaf blade; not swollen. Stipules present; free from one another; laterally placed; not encircling the twig; scale-like; fringed, or not fringed (fringed in Prunus phaeosticta); small; not persistent. Domatia present, or absent; scattered across lamina. Basal glands present, or 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, or on an unbranched axis; specialized inflorescence units absent. Flowers bisexual; stalked; about 0.5 cm long or across; round; with male or female parts not raised on a column. Hypanthium present. Disk present; the stamens outside the disk. Perianth present; with distinct calyx and corolla whorls. Sepals 5; partially joined; persistent in fruit, or not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 5; free; not fleshy; deciduous; entire. Stamens 100 (many); filaments present; free of each other; free of the perianth; all equal in size; polystemonous. Anthers 2 loculed; attached by the base; not awned; dehiscing by long slits. Ovary superior. Carpels solitary; 1. Locules 1. Styles solitary. Stigmas 1 lobed; distinctive; head shaped. Fruit drupaceous; fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 1 per fruit; less than 5 mm, or about 1 cm long, or much more than 1 cm long; wingless; uniform in cross-section; aril absent; non-endospermic.

Slash smelling of almond/cyanide; two glands sometimes found at base of lamina. Taxon images: genprunu.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.