Australian Tropical Rainforest Plants - Online edition

Medicosma heterophylla T.G.Hartley

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Leaves, Herbarium specimen. © Australian Tropical Herbarium
Scale bar 10mm. © CSIRO

Hartley, T.G. (2013) Flora of Australia 26: 91, 582. Type: Qld. Cook District. Track on Pinnacle Rock, 4 km W of Karnak, Qld, 12 July 1994, P.I.Forster 15541 et al.


Seldom exceeding 30 cm dbh.


Leaves trifoliolate and simple. Numerous oil dots visible with a lens. Leaf blades about 3.5-8 x 1.4-3.6 cm. Crushed leaves emit a conspicuous odour which is difficult to describe. Lateral veins forming loops inside the blade margin.


Pedicels about 2-3 mm long. Calyx marked with yellow oil dots. Petals about 1.5-2 mm long. Stamens eight, dimorphic, four long and four short. Staminal filaments flattened, margins fimbriate. Disk yellow, margin crenate or wavy. Style hairy and divided towards the base. Stigma yellow.


Fruits glabrous, 4-6 mm long. Seed characters unknown.


Features not available.

Distribution and Ecology

Endemic to NEQ, known along Roaring Meg Creek and the vicitiny of Karnak, Daintree River National Park. Altitudinal range from 450-1000 m. Grows as an understory tree in well developed upland and mountain rain forest.


Medicosma sp. Pieter Botte (B.Hyland 3503RFK).  Medicosma sp. Karnak (P.I.Forster PIF15541).

RFK Code
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