Australian Tropical Rainforest Plants - Online edition

Polyosma rhytophloia C.T.White & W.D.Francis

Shrub (woody or herbaceous, 1-6 m tall)
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Leaves and Flowers. © CSIRO
Fruit, four views, cross section and seed. © W. T. Cooper
Leaves and Flowers. © CSIRO
Scale bar 10mm. © CSIRO
Cotyledon stage, epigeal germination. © CSIRO
10th leaf stage. © CSIRO

White, C.T. & Francis, W.D. (1926) Proceedings of the Royal Society of Queensland 37: 158. Type: Eungella Range, about 40 miles westward of Mackay, W.D. Francis, October 3rd to 12th, 1922 (flowering specimens, type).

Common name

Wrinkled Bark Polyosma


Seldom exceeding 30 cm dbh. Lenticels usually conspicuous, pale, forming longitudinal lines on the stem. Oak grain in the inner blaze.


Leaf blades about 7.5-12 x 2.5-6 cm. Midrib depressed on the upper surface. Lateral veins forming definite loops well inside the blade margin. Teeth peg-like, slightly curved, and appear as though attached as an afterthought.


Calyx glabrous on the outer surface, lobes about 0.5 mm long. Corolla pubescent on the outer surface, about 12-13 mm long. Staminal filaments about 7 mm long. Ovary tends to be 2-locular near the base and apex, but unilocular about the middle. Style about 12 mm long, stigma +/- peltate.


Fruits glabrous or minutely puberulous, globular or obovoid, about 10-12 x 9-10 mm. Seeds about 7-9 x 6-7 mm, mucronate at the apex.


Cotyledons linear-obovate, about 5-7 mm long, base sessile. First pair of leaves toothed with about 2-4 teeth along each margin. At the tenth leaf stage: leaf blade elliptic to obovate, apex acute or mucronate, base cuneate to attenuate, margin serrate, teeth with a fine point at the apex, 5-8 along each margin, hairy on the upper surface. Seed germination time 251 to 281 days.

Distribution and Ecology

Endemic to Queensland, occurs in NEQ and CEQ. Altitudinal range in NEQ from 600-1200 m. Grows as an understory tree in well developed upland and mountain rain forest.

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