PNGTreesKey – Haplolobus floribundus (K.Schum.) H.J.Lam


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

Haplolobus floribundus (K.Schum.) H.J.Lam

Annales du Jardin Botanique de Buitenzorg Vol. 42: 207 (1932)

Other Literature: P.W. Leenhouts, Flora Malesiana, Series 1, 244 (1956)

Family: Burseraceae

Timber Group: Occasional timber species

Field Characters: Large canopy tree (10-30 m high, sometimes to 35 m) or Small sub-canopy tree; Bole cylindrical or markedly fluted (45-60 cm diam.); straight (bole 15-25 m long); buttresses buttresses present; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark brown (and slightly greyish), rough, scaly or flaky, slightly fissured, or slightly pustular, lenticels irregular; Subrhytidome (under-bark) pale yellow or yellowish brown; less than 25 mm thick, 5.0-10.0; bark blaze consisting of one layer; faintly to non-aromatic or strongly aromatic; resinous/linament-like (Canarium-like); outer blaze pale yellow or yellowish brown, markings absent, fibrous or granular without splinters; inner blaze pale yellow or yellowish brown, markings absent, fibrous or granular without splinters; bark exudate (sap) present, colourless, not readily flowing (spotty) (very little exudate), colour not changing on exposure to air, not sticky or 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), compound (a leaf made up from two or more leaflets); petiole present, not winged, attached to base of leaf blade, at base swollen; leaves rarely with three leaflets (trifoliate) or pinnate (unbranched with more than three leaflets); petiolule not swollen or swollen (at base and apex); rachis present, absent, absent; leaves with a terminal leaflet (the number of leaflets odd - imparipinnate), equally broad throughout much of length, 19.0-24.0 cm, 6.0-10.0 cm, leaflets opposite, symmetric, terminal developing leaflet buds straight; venation pinnate, secondary veins open, prominent, intramarginal veins absent; leaves lower surface green, upper surface green (glossy), indumentum (hairs) absent; absent; domatia absent; stipules absent.

Flowers: Inflorescence sometimes terminal or axillary, flowers on a branched axis, cones absent; flowers unisexual, unisexual with male and female flowers on different plants, stalked, flowers with many planes of symmetry, 2.5-3.5 mm long, diameter small (up to10 mm diam.); perianth present, with distinct sepals and petals whorls, inner perianth yellow; 3, free; stamens 6, present, free of each other, free of the perianth (slightly joined to disk); ovary superior, carpels joined (when more than one), locules 3; styles solitary, 1.

Fruits: Infrutescence arranged on branched axis, fruit 15.0-18.0 mm long, 9.0-11.0 mm diam., dark blue or black, not spiny, non-fleshy, simple, indehiscent, drupe; seeds 1, about 10 mm long, not winged, broad (as wide as long), seed 1-10 mm diam.

Distribution: West Sepik, East Sepik, Madang, Morobe, Western, Gulf, Central, Northern, Milne Bay, Papuan Islands & New Britain.

Haplolobus floribundus
Botanical records
in PNGplants database

Map details