PNGTreesKey – Dillenia montana Diels


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

Dillenia montana Diels

Botanische Jahrbucher für Systematik, Pflanzengeschichte und Pflanzengeographie Vol. 57: 437 (1922)

Other Literature: R.D. Hoogland, Flora Malesiana, Series 1, 161 (1951)

Family: Dilleniaceae

Timber Group: Non-timber species

Field Characters: Large canopy tree (up to 35 m high); Bole cylindrical or markedly fluted (20-40 cm diam.); straight (bole up to c. 15 m long); buttresses buttresses present or buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark red or brown, rough, scaly or flaky (rectangular flakes) or peeling; Subrhytidome (under-bark) pale yellow; less than 25 mm thick; bark blaze consisting of one layer; faintly to non-aromatic; outer blaze pink or pale brown, with stripes; inner blaze pink or pale brown, with stripes; bark exudate (sap) present, colourless, flowing, 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) present, hairs dense.

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 or winged when young, attached to base of leaf blade, not swollen; leaves broadest at or near middle, (10.0-) 15.0-21.0 cm, (6.0-) 10.0-17.5 cm; symmetric, serrate to dentate (toothed) (shortly), not dissected or lobed, rounded or acuminate (shortly), venation pinnate (with 9-14 vein-pairs), secondary veins open, prominent, intramarginal veins absent; leaves lower surface dark green (glossy), upper surface dark green (glossy), indumentum (hairs) present, indumentum (hairs) dense; absent; domatia absent or present, scattered along midrib (hairy); stipules absent.

Flowers: Inflorescence axillary, flowers on an unbranched axis, cones absent; flowers bisexual, stalked, flowers with many planes of symmetry, 30.0-35.0 mm long, diameter large (more than10 mm diam.) (c. 30 mm diam.); perianth present, with distinct sepals and petals whorls (petals not persistent), inner perianth yellow; 5, free; stamens 100 (c.), present, free of each other, free of the perianth; ovary superior, carpels separate (when more than one) or partially joined, by base, locules 8-9; styles free, 8-9.

Fruits: Infrutescence arranged on unbranched axis, fruit presumably not spiny, presumably fleshy, aggregate, presumably dehiscent, follicle (presumably (with each carpel of the flower expected to form a 1-seeded follicle).

Distribution: East Sepik or Eastern Highlands.

Dillenia montana
Botanical records
in PNGplants database

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