PNGTreesKey – Pinus oocarpa Schiede. in Schltdl.
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
Linnaea Vol. 12:
Other Literature: 491 (1838)
Timber Group: Softwood or Plantation species
Field Characters: Large canopy tree or Small sub-canopy tree (up to 20 m high, sometimes to 35 m); Bole cylindrical (c. 25 cm diam.); straight (branching from near base); buttresses buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark grey, rough, furrowed cork; Subrhytidome (under-bark) red or brown; less than 25 mm thick (10 mm thick), 10.0-12.0; bark blaze with two layers (outer layer dead and corky); strongly aromatic; resinous/linament-like or pine-like; outer blaze brown, with stripes, corky; inner blaze white, markings absent, fibrous; bark exudate (sap) present, colourless, not readily flowing (spotty), colour not changing on exposure to air (except when dry then turning milky), sticky; terminal buds not enclosed by leaves.
Indumentum: Complex hairs absent; stinging hairs absent; mature twig indumentum (hairs) absent.
Leaves: Leaves spaced along branches (but on distal ends of branches), whorled (with more than two leaves at one node of a branchlet) (held out from branchlets, hence patent) or spiral (leaves occurring singly at a node and arranged spirally up the branchlet) (arranged in leaf bundles, with basal sheath c. 15 mm long, soon falling off), 3 (usually per bundle), simple (a leaf composed of a single blade); petiole absent; leaves equally broad throughout much of length (needle-like), 15.0-22.0 cm, 0.5 (c.) cm; symmetric, entire or slightly crenate, not dissected or lobed, acute, venation parallel-veined, secondary veins closed, not prominent, but visible, intramarginal veins absent (with 2-4 resin canals in median position - view in cross-section); leaves lower surface blue-green, upper surface pale green or blue-green, indumentum (hairs) absent; absent; domatia absent; stipules absent.
Flowers: Inflorescence on the trunk or branches (basal to current leaves), flowers on an unbranched axis, flowers arranged in a cone (strobilus) (male flowers in narrowly cylindrical strobili, strobili in clusters around base of young shoots); flowers unisexual, unisexual with male and female flowers on the same plant, not stalked, flowers with one plane of symmetry; perianth absent; stamens 1, absent, free of each other; ovary superior, carpels separate (when more than one), locules 2; styles absent.
Fruits: Infrutescence arranged on unbranched axis, arrangement of fruits present (ovoid or oblong-ovoid, symmetrical or oblique at base, often curved), cone 50.0-100.0 mm, 30.0 (c.) mm, brown (pale (often with reddish tinge); seeds 100 (2 per scale), about 10 mm long (c. 8 mm long), winged, narrow (longer than wide), seed 1-10 mm diam. (c. 4 mm diam.).
Distribution: Morobe (Plantation species).
in PNGplants database