PNGTreesKey – Acronychia murina Ridl.


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

Acronychia murina Ridl.

Transactions of the Linnaean Society, Botany Vol. 9: 25 (1916)

Family: Rutaceae

Timber Group: Non-timber species

Field Characters: Small sub-canopy tree (mostly 15-25 m high, sometimes a large shrub); Bole almost cylindrical or markedly fluted (usually up to 40 cm diam.); straight (up to 6 m long); buttresses buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark white or pale yellow, rough, tessellated, slightly furrowed cork, or fissured; Subrhytidome (under-bark) yellow or yellowish brown; less than 25 mm thick, 8.0-12.0; bark blaze with two layers; strongly aromatic; resinous/linament-like; outer blaze yellow, pale brown, or white, markings absent, fibrous; inner blaze pink or pale yellow, with stripes, granular without splinters; bark exudate (sap) present, colourless, not readily flowing (spotty), colour not changing on exposure to air, not sticky; terminal buds not enclosed by leaves.

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

Leaves: Leaves spaced along branches, opposite (in pairs, opposite one another on the branchlet), simple (a leaf composed of a single blade); petiole present, not winged, attached to base of leaf blade, not swollen; leaves equally broad throughout much of length or broadest at or near middle, 4.0-7.0 cm, 2.0-3.5 cm; symmetric, entire, not dissected or lobed, mucronate or acuminate (shortly), venation pinnate, secondary veins open, not prominent, but visible, intramarginal veins absent; leaves lower surface pale green, upper surface dark green (glossy), indumentum (hairs) absent; present; domatia absent; stipules absent.

Flowers: Inflorescence axillary, flowers on a branched axis, cones absent; flowers bisexual, stalked, flowers with many planes of symmetry; perianth present, with distinct sepals and petals whorls, inner perianth yellow (greenish pale); 5, free; stamens 5, present, free of each other, free of the perianth; ovary superior, carpels joined (when more than one), locules 4; styles solitary, 1.

Fruits: Infrutescence arranged on branched axis, fruit 80.0 mm long, 60.0 mm diam., yellow, white, or cream-coloured, not spiny, fleshy, simple, indehiscent, hesperidium; seeds 4, to about 5 mm long (2-3 mm long), not winged, broad (as wide as long), seed 1-10 mm diam. (c. 2 mm diam.).

Distribution: Morobe or Central.

Acronychia murina
Botanical records
in PNGplants database

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