PNGTreesKey – Buchanania macrocarpa Laut.


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

Buchanania macrocarpa Laut.

Botanische Jahrbucher für Systematik, Pflanzengeschichte und Pflanzengeographie Vol. 56: 350 (1920)

Other Literature: Ding Hou, Flora Malesiana, Series 1, 418 (1978) Fig. 5.

Family: Anacardiaceae

Timber Group: Commercial hardwood

Field Characters: Large canopy tree (30-39 m high); Bole cylindrical (50-100 cm diam., rarely to 200 cm); straight (bole 20-26 m long); buttresses occasionally buttresses present or buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark pale grey or greyish brown, slightly rough or smooth, slightly pustular or finely cracked, rarely lenticels rounded/swelling or lenticels irregular; Subrhytidome (under-bark) red; less than 25 mm thick, 10.0; bark blaze with two layers; faintly to non-aromatic; outer blaze brown, fibrous; inner blaze white, fibrous; bark exudate (sap) present or absent, colourless (yellowish), not readily flowing (spotty), 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 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 above middle or broadest at or near middle, (12.0-) 26.0-45.0 cm, (4.0-) 9.0-16.0 cm; symmetric, entire, not dissected or lobed, rounded or obtuse, venation pinnate, secondary veins open, prominent, intramarginal veins absent; leaves indumentum (hairs) present, dense to sparse; absent; domatia absent; stipules absent.

Flowers: Inflorescence axillary, flowers on a branched axis, cones absent; flowers bisexual, not stalked to stalked (shortly), flowers with many planes of symmetry, 2.0-2.5 mm long, diameter small (up to10 mm diam.); perianth present, with distinct sepals and petals whorls, inner perianth white (cream-coloured); (4-) 5 (-6), free; stamens (8-) 10 (-12), present, free of each other, free of the perianth; ovary superior, carpels separate (when more than one), locules 4-(1 per carpel)-6; styles solitary, 1.

Fruits: Infrutescence arranged on branched axis, fruit 16.0-21.0 mm long, brown, not spiny, fleshy, aggregate, indehiscent, drupe; seeds 1, much more than 10 mm long, not winged, broad (as wide as long), seed more than 10 mm diam.

Distribution: West Sepik, East Sepik, Madang, Morobe, Southern Highlands, Western, Gulf, Central, Northern, Milne Bay, Papuan Islands, New Britain, New Ireland, Manus, Bougainville.

Buchanania macrocarpa
Botanical records
in PNGplants database

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