PNGTrees – Polyosma integrifolia Blume
Barry Conn (NSW) & Kipiro Damas (LAE).
Copyright held by the authors, Royal Botanic Gardens and Domain Trust, and Papua New Guinea National Herbarium
Bijdragen tot de Flora van Nederlandsch Indie Vol. 13: 659 (1826)
Field Characters: Small trees 5-15 m high. Bole cylindrical 10-20 cm diam.; straight bole up to about 5 m long or slightly crooked; buttresses absent; spines absent; aerial roots absent; stilt roots absent. Bark brown or grey, rough; subrhytidome green; bark thickness <25 mm thick. Terminal buds not enclosed by leaves; complex hairs absent; stinging hairs absent; mature twig without hairs.
Leaves: Spaced along branches <internodes readily visible>. Leaves opposite, simple; petiole present 10-25 mm long, not winged, attached to base of leaf blade <not peltate>, not swollen; lamina broadest at or near middle, (4.0-) 5.0-18.0 cm long, 1.5-5.0 (-8.0) cm wide; lamina symmetric, margin serrate to dentate (toothed), 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 present; lower surface green or pale green, upper surface green, hairs absent; oil dots absent; domatia absent; stipules absent.
Flowers: Inflorescence axillary <from between a leaf and branch>. Flowers on an unbranched axis; flowers bisexual, stalked, with many planes of symmetry <actinomorphic>, 5.0-8.0 mm long, small (< or =10 mm diam.) about 5 mm diam.; perianth present, with distinct sepals and petals, cream-coloured or white; inner perianth 4, some or partly joined to form a corolla tube; stamens 4 (slightly shorter than petals), filaments present, free of each other; ovary inferior <seated below the petals and sepals; epigenous>, carpels joined (when more than one) <syncarpous>, locules 1; styles solitary <including joined together>, 1.
Fruits: Fruits arranged on unbranched axis. Fruit 5-7 (-10) mm long, 3.0-4.0 mm diam., fruit green when immature, blue, or purple when mature, not spiny, fleshy, simple, indehiscent, drupe. Seeds 1, not winged.
Distribution: Southern Highlands, Manus & Morobe.
in PNGplants database
Notes: Polyosma has previously been placed in the Cunoniaceae, Escalloniaceae, Grossullariaceae and Saxifragaceae families.