PNGTreesKey – Celtis rubrovenia Elmer


Barry Conn (NSW) & Kipiro Damas (LAE).
Guide to trees of Papua New Guinea
Copyright held by the authors, National Herbarium of New South Wales, and Papua New Guinea National Herbarium

Celtis rubrovenia Elmer

Leaflets of Philippine Botany Vol. 2: 464 (1908)

Other Literature: E. Soepadmo, Flora Malesiana, Series 1, 65-66 (1977) Fig. 23.

Family: Cannabaceae

Timber Group: Non-timber species

Field Characters: Large canopy tree (up to c. 30 m high); Bole cylindrical (up to c. 60 cm diam.); straight (bole up to c. 20 m long); buttresses slightly buttresses present; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark grey or brown, slightly rough or smooth, slightly scaly or flaky or slightly peeling; bark blaze consisting of one layer; faintly to non-aromatic; outer blaze white, pale yellow, or pale brown, speckled (pale coloured); inner blaze white, pale yellow, or pale brown, speckled (pale coloured); bark exudate (sap) present, colourless, not readily flowing (spotty), colour changing on exposure to air, to purple, not sticky or slightly sticky; terminal buds not enclosed by leaves.

Indumentum: Complex hairs absent; stinging hairs absent; mature twig indumentum (hairs) present or absent, hairs sparse.

Leaves: Leaves spaced along branches, spiral (leaves occurring singly at a node and arranged spirally up the branchlet), simple (a leaf composed of a single blade); petiole present, not winged, attached to base of leaf blade, not swollen; leaves broadest below middle, (3.0-) 4.0-5.0 (-6.5) cm, (1.2-) 1.5-2.5 (-3.5) cm; very asymmetric to symmetric, entire (throughout) to crenate (distally), not dissected or lobed, acute to acuminate, venation distally pinnate or at base trinerved, secondary veins open, prominent, intramarginal veins absent; leaves lower surface pale green, upper surface dark green, indumentum (hairs) absent when mature or present when immature, indumentum (hairs) sparse; absent; domatia absent; stipules present, free, laterally placed, not encircling the twig, leafy, not fringed, large, persistent.

Flowers: Inflorescence axillary, flowers on an unbranched axis, cones absent; flowers unisexual, unisexual with male and female flowers on the same plant, stalked, flowers with many planes of symmetry, 2.0-2.5 mm long, diameter small (up to10 mm diam.); perianth present, with all sepals and/or petals (hence tepals) similar, inner perianth pale yellow; 5, free; stamens 5, present, free of each other, free of the perianth; ovary superior, carpels joined (when more than one), locules 1; styles absent.

Fruits: Infrutescence arranged on branched axis, fruit 3.0 (c.) mm long, green when immature or blue when immature, not spiny, fleshy, simple, indehiscent, drupe; seeds 1, to about 5 mm long, not winged, broad (as wide as long), seed 1-10 mm diam.

Distribution: Morobe.

Celtis rubrovenia
Botanical records
in PNGplants database

Map details


Notes: Notes The genus Celtis was previously classified in the separate family Ulmaceae.