Australian Tropical Rainforest Plants - Online edition

Breynia sp. Black Mountain (B.Hyland 25658RFK)

Shrub (woody or herbaceous, 1-6 m tall)
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Leaves and fruit. © CSIRO
Scale bar 10mm. © CSIRO
Cotyledon stage, Epigeal germination. © CSIRO
10th leaf stage. © CSIRO

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Usually a small tree not exceeding 30 cm dbh. Blaze odour may resemble that of Alphitonia spp.


Stipules narrowly triangular, almost filiform, about 1 mm long. Leaf blades about 15-25 x 7-11 mm. Leaves distichous, produced on branches or short shoots so that the whole structure resembles a compound leaf. Petioles transversely wrinkled.


Flowers small, less than 3 mm diam. at anthesis.


Fruits globular or depressed globular, about 5-10 mm diam., on very slender pedicels about 6-10 mm long. Fruits 5-lobed, wider than long. Seeds about 2-3 mm long. Testa dark brown, surface colliculate. Embryo about 2 mm long, radicle about 1 mm long, cotyledons about 1 mm long.


Cotyledons elliptic, about 6-8 x 3-4 mm. First pair of leaves orbicular or broadly spathulate. At the tenth leaf stage: leaf blade elliptic, about 10 x 5-6 mm, produced on short lateral shoots resembling compound leaves. Stipules linear, very small, about 1 mm long, soon turning brown. Seed germination time 18 to 38 days.

Distribution and Ecology

Endemic to Queensland, occurs in CYP and NEQ. Altitudinal range from 100-200 m. Grows in monsoon forest among granite boulders and similar habitats.

RFK Code
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