Siphonodon

Family Celastraceae. Order Celastrales.

Large trees to small trees. Buttresses present, or absent; tall. Spines absent. Stilt roots absent. Bark gray, brown; not peeling in strips. Slash yellow, 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, or two-ranked; not scale-like; simple; all of the same type; not modified into spines; coriaceous, or paper-like; not gland-dotted; very asymmetric at the base, or symmetric at the base; not dissected; with small to large teeth on margin. Epidermis not waxy. Venation pinnate. Secondary veins open; prominent. Smallest veins prominent, or not prominent, but visible; net like, or 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 present; free from one another; laterally placed; not encircling the twig; scale-like; not fringed; small; not persistent. Domatia absent. Basal glands absent. Hairs on mature leaf absent.

Inflorescences present, or represented by solitary flowers only; axillary; on an unbranched axis; specialized inflorescence units absent; numerous and persistent inflorescence bracts present at the bottom of the inflorescence. Flowers bisexual; 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 inside the disk. Perianth present; with distinct calyx and corolla whorls. Sepals 5; partially joined; not persistent in fruit; not growing any further after flowering. Epicalyx absent. Petals present; 5; free; not fleshy; deciduous; not stalked; entire. Stamens 5; filaments present; joined; free of the perianth; all equal in size; isomerous; opposite the sepals (when isomerous). Anthers 2 loculed; attached by the base; not awned; dehiscing by long slits. Ovary superior, or partly inferior. Carpels joined; 3. Locules 100 (many). Styles solitary. Stigmas 1 lobed; not distinctive. Fruit drupaceous; fleshy; not multiple; not splitting; not enclosed in, or sitting on, fleshy perianth parts; wingless. Seeds 100 per fruit (many); barely visible, or less than 5 mm; wingless; uniform in cross-section; aril absent; endospermic.

Leaves spiral or distichous; margins toothed; ovary semi-inferior; ovary with many locules; fruit drupaceous with numerous one-seeded pyrenes. Taxon images: gensiph.gif siphon.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.