PNGTreesKey – Sterculia edelfeltii F.Muell.
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
Victorian Naturalist Vol. 3: 47 (1886)
Other Literature: Lembaga Penelitian Hutan 123-124 (1976)
Timber Group: Non-timber species
Field Characters: Small sub-canopy tree (up to 20 m high); Bole cylindrical (up to c. 45 cm diam.); straight (bole up to c. 10 m long); buttresses buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark brown or brownish green, rough; Subrhytidome (under-bark) green; less than 25 mm thick; bark blaze consisting of one layer; faintly to non-aromatic; outer blaze white or yellow (pale (straw-coloured), with stripes, fibrous; inner blaze yellow (pale (straw-coloured) or white, with stripes, fibrous; bark exudate (sap) absent; terminal buds not enclosed by leaves.
Indumentum: Complex hairs present (sparse), star-like (stellate); stinging hairs absent; mature twig indumentum (hairs) present when young or soon absent, hairs dense to sparse (stellate hairy).
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 at or near middle, 9.0-15.0 cm, 5.5-8.0 cm; symmetric, entire, not dissected or lobed, acuminate (shortly) to obtuse, venation pinnate, secondary veins open, prominent, intramarginal veins absent; leaves lower surface pale green to green, upper surface green, indumentum (hairs) present, indumentum (hairs) sparse (scattered stellate hairs, particularly on lower surface); absent; domatia absent; stipules present, free, laterally placed, not encircling the twig, leafy (triangular), not fringed, large (c. 5 mm long), not persistent (soon dehiscent, only present at growing point of branchlets).
Flowers: Inflorescence axillary, flowers on a branched axis, cones absent; flowers unisexual, unisexual with male and female flowers on the same plant, stalked, flowers with many planes of symmetry, 7.0-8.0 mm long, diameter small (up to10 mm diam.) (c. 5-7 mm diam.); perianth present, with all sepals and/or petals (hence tepals) similar, inner perianth green or greenish red; 5, some or partly joined (forming a perianth tube and 5 perianth lobes); stamens 15 (c. (male flowers), absent, joined (to form a staminal tube around the ovary and style), free of the perianth; ovary superior, carpels separate (when more than one), locules 4; styles free, 4.
Fruits: Infrutescence arranged on branched axis, fruit presumably not spiny, aggregate, dehiscent, follicle; seeds about 10 mm long, not winged, seed 1-10 mm diam.
Distribution: Madang, Morobe, Eastern Highlands, Central & Milne Bay.
in PNGplants database
Notes: Notes The genus Sterculia was previously classified in the family Sterculiaceae. Sterculia edelfeltii is a very inadequately known species, such that its taxonomic status is unclear.