PNGTreesKey – Helicia subcordata Foreman
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
Muelleria Vol. 6: 89-91 (1985) Fig. 7.
Other Literature: D.B. Foreman, Handbooks of the Flora of Papua New Guinea 265 (1995) Fig. 68.
Timber Group: Non-timber species
Field Characters: Large canopy tree (10-25 m high) or Small sub-canopy tree; Bole cylindrical (up to c. 30 cm diam.); straight (bole up to c. 15 m long); buttresses buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark dark brown, rough, pustular, lenticels elongated vertically; Subrhytidome (under-bark) red or brown; less than 25 mm thick, 5.0-8.0; bark blaze consisting of one layer; faintly to non-aromatic; outer blaze slightly yellow or yellowish brown, markings absent, granular with splinters; inner blaze slightly yellow or yellowish brown, markings absent, granular with 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) present when young or absent, hairs sparse.
Leaves: Leaves clustered at end of branches or spaced along branches, spiral (leaves occurring singly at a node and arranged spirally up the branchlet) (leaves almost sub-opposite because internodes very short), simple (a leaf composed of a single blade); petiole almost absent or present (very short), winged (slightly (leaf lamina subcordate), attached to base of leaf blade, swollen; leaves broadest above middle, 24.0-34.0 cm, 10.0-11.0 cm; symmetric, entire, not dissected or lobed, rounded or broadly obtuse, venation pinnate, secondary veins open, not prominent, but visible, intramarginal veins absent; leaves lower surface dark green (glossy) or brown (pale (greenish-brown), upper surface dark green (sub-glossy) or green, indumentum (hairs) absent; absent; domatia absent; stipules absent.
Flowers: Inflorescence on the trunk or branches (ramiflorous), flowers on an unbranched axis, cones absent; flowers bisexual, stalked, flowers with one plane of symmetry, 28.0-30.0 mm long, diameter small (up to10 mm diam.) (6-8 mm diam.); perianth present, with all sepals and/or petals (hence tepals) similar, inner perianth white or cream-coloured; 4, some or partly joined; stamens 4, absent, free of each other, joined to the perianth; ovary superior, carpels joined (when more than one), locules 1; styles solitary, 1.
Fruits: Infrutescence presumably arranged on unbranched axis.
in PNGplants database
Notes: Notes This very distinctive species has only been collected from near Wagau (Morobe province). The fruits of this species have not been seen.