PNGTreesKey – Protium macgregorii (F.M.Baill.) Leenh.


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

Protium macgregorii (F.M.Baill.) Leenh.

Acta Botanica Neerlandica Vol. 2: 305 (1953)

Other Literature: P.W. Leenhouts, Flora Malesiana, Series 1, 214-215 (1956)

Family: Burseraceae

Timber Group: Non-timber species

Field Characters: Large canopy tree (up to c. 30 m high) or Small sub-canopy tree; Bole markedly fluted (up to c. 45 cm diam.); crooked (bole up to c. 15 m long); buttresses buttresses present; spines spines absent; aerial roots aerial roots present; stilt roots stilt roots absent; Bark grey or dark brown, rough, slightly pustular or scaly or flaky, lenticels irregular; Subrhytidome (under-bark) red; more than 25 mm thick, 25.0-27.0; bark blaze consisting of one layer; strongly aromatic; pleasant; outer blaze pink, red, or brown, with stripes, fibrous; inner blaze pink, red, or brown, with stripes, fibrous; bark exudate (sap) present, colourless, not readily flowing (spotty), colour changing on exposure to air, to brown or orange, slightly sticky; terminal buds not enclosed by leaves.

Indumentum: Complex hairs absent; stinging hairs absent; mature twig indumentum (hairs) present when young or later absent, hairs dense.

Leaves: Leaves spaced along branches, spiral (leaves occurring singly at a node and arranged spirally up the branchlet), compound (a leaf made up from two or more leaflets); petiole present, not winged, attached to base of leaf blade, not swollen; leaves pinnate (unbranched with more than three leaflets); petiolule swollen (at both base and tip) or not swollen; rachis present, absent, absent; leaves with a terminal leaflet (the number of leaflets odd - imparipinnate), broadest at or near middle or broadest below middle, 3.0-11.0 (-15.0) cm, 1.5-6.0 cm, leaflets opposite, symmetric, terminal developing leaflet buds straight; venation pinnate, secondary veins open, prominent, intramarginal veins absent; leaves lower surface green, upper surface dark green, indumentum (hairs) absent; absent; domatia absent; stipules absent.

Flowers: Inflorescence axillary, flowers on a branched axis, cones absent; flowers unisexual or rarely bisexual, unisexual with male and female flowers on different plants, stalked, flowers with many planes of symmetry, 2.0 (c.) mm long, diameter small (up to10 mm diam.); perianth present, with all sepals and/or petals (hence tepals) similar; usually 4-5, free; stamens 8-10, present, free of each other, free of the perianth; ovary superior, carpels joined (when more than one), locules 2-4; styles solitary, 1.

Fruits: Infrutescence arranged on branched axis, fruit 7.0-8.0 mm long, slightly red or reddish brown, not spiny, non-fleshy, simple, indehiscent, drupe; seeds 2-3 (-4), to about 5 mm long, not winged, broad (as wide as long), seed 1-10 mm diam.

Distribution: Madang, Morobe, Western Highlands, Central & Milne Bay.

Protium macgregorii
Botanical records
in PNGplants database

Map details