PNGTreesKey – Pinus kesiya Royle ex. Gordon


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

Pinus kesiya Royle ex. Gordon

Gardener's Magazine and Register of Rural and Domestic Improvement Vol. 16: 8 (1840)

Family: Pinaceae

Timber Group: Softwood or Plantation species

Field Characters: Large canopy tree (20 m high); Bole cylindrical (c. 30 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 or brown, rough, scaly or flaky (flakes easily removed); Subrhytidome (under-bark) brown; less than 25 mm thick (6 mm thick), 6.0-8.0; bark blaze with two layers (outer layer of dead cork); strongly aromatic; resinous/linament-like or pine-like; outer blaze pale red or brown, with stripes (layers of cork), corky; inner blaze white or slightly pink, markings absent, fibrous; bark exudate (sap) present, colourless, not readily flowing (spotty) (flowing after some time), colour not changing on exposure to air, sticky; terminal buds not enclosed by leaves.

Indumentum: Complex hairs absent; stinging hairs absent; mature twig indumentum (hairs) absent.

Leaves: Leaves clustered at end of branches or spaced along branches (slightly (leaves tending to 'stand-out' at right-angles to branchlet), whorled (with more than two leaves at one node of a branchlet) or spiral (leaves occurring singly at a node and arranged spirally up the branchlet) (leaf bundles), (2-) (usually (with a persistent basal sheath 8-19 mm long) 3-5, simple (a leaf composed of a single blade); petiole absent; leaves equally broad throughout much of length (needle-like), 3.0-10.0 cm, 0.5 (c.) cm; symmetric, not dissected or lobed, acute or obtuse, venation parallel-veined, secondary veins closed, not prominent, but visible, intramarginal veins absent (with marginal resin canals - view in cross-section); leaves lower surface greenish grey or green (glossy (with stomatic lines), upper surface green (glossy (with stomatic lines), indumentum (hairs) absent; absent; domatia absent; stipules absent.

Flowers: Inflorescence terminal or axillary, 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 branched axis, arrangement of fruits present, cone 6.0-10.0 mm, 3.0 mm, pale brown; seeds 100 (2 per scale), much more than 10 mm long (c. 24-26 mm long), winged (wing strongly developed, rounded at apex), narrow (longer than wide), seed 1-10 mm diam. (c. 8 mm diam.).

Distribution: Morobe (Plantation species).

Pinus kesiya ex.
Botanical records
in PNGplants database

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