PNGTrees – Hopea papuana Diels
Barry Conn (NSW) & Kipiro Damas (LAE).
Copyright held by the authors, Royal Botanic Gardens and Domain Trust, and Papua New Guinea National Herbarium
Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie Vol. 57: 461 (1922)
Other Literature: P.S. Ashton, Flora Malesiana, Series 1 Vol. 9: 419-420 (1982)
Field Characters: Large trees 30-35 m high. Bole cylindrical 35 cm diam.; straight bole 25 m long; buttresses present; spines absent; aerial roots absent; stilt roots absent. Bark dark brown, rough, scaly or flaky or slightly pustular; lenticels irregular; subrhytidome green or yellow; bark thickness <25 mm thick, 10.0 mm thick; blaze consisting of one layer; strongly aromatic; resinous/linament-like; outer blaze orange or yellow, markings absent, fibrous; inner blaze orange or yellow, markings absent, fibrous; exudate present, colourless, spotty, changing colour on exposure to air, to blue or purple, slightly sticky. Terminal buds not enclosed by leaves; complex hairs present; stinging hairs absent; mature twig hairy; hairs sparse.
Leaves: Spaced along branches <internodes readily visible>. Leaves spiral, simple; petiole present, not winged, attached to base of leaf blade <not peltate>, not swollen; lamina broadest at or near middle, (11.0-) 16.0-24.0 (-28.0) cm long, (4.2-) 7.0-10.5 cm wide; lamina symmetric, margin entire, not dissected or lobed, apex acuminate, venation pinnate <secondary veins arising from the midrib along its length>, secondary veins open <spaced far apart to easily see tertiary veins>, prominent, intramarginal veins absent; lower surface pale green, upper surface dark green, hairs absent; oil dots absent; domatia absent; stipules absent (by misinterpretation) or present not persistent, free <from one another>, laterally placed <whether free or joined>, not encircling the twig, hair-like linear, not fringed, large <easily visible to the eye> up to 12 mm long, 5 mm wide, not persistent.
Flowers: Inflorescence axillary <from between a leaf and branch> flowers unknown. Flowers on a branched axis; flowers presumably bisexual, shortly stalked in fruit, presumably with many planes of symmetry <actinomorphic> based on flowers of other species; perianth present, with distinct sepals and petals; inner perianth presumably 5, some or partly joined because joined at base in other species; filaments present, free of each other, free of perianth; ovary superior <seated above petals and sepals; hypogenous>, carpels joined (when more than one) <syncarpous>, locules 3; styles solitary <including joined together>, 1.
Fruits: Fruits arranged on branched axis. Fruit 10-16 mm long, 7.0-9.0 mm diam., fruit brown, not spiny, non-fleshy, simple, indehiscent, nut. Seeds 1, about 10 mm long, not winged fruits winged.
Distribution: Western, Northern, Milne Bay, Central & West Sepik.
in PNGplants database