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Claoxylon hillii

Family

Euphorbiaceae

Botanical Name

Claoxylon hillii Benth.

Bentham, G. (1873) Flora Australiensis 6: 131. Type: Queensland. Cape York, MGilivray, Daemel; Albany island, W. Hill. (all males); Rockingham Bay, Dallachy (females).

Stem

Small evergreen tree to 15 m tall. Hard yellowish or orange layers often present in the blaze. Blaze odour apparent, difficult to describe but usually unpleasant. Cambial layer may turn purplish on exposure.

Leaves

Oil dots visible with a lens. About 1-2 small raised glands usually present on the upper side of the petiole at its junction with the leaf blade. Leaf blades about 9-30 x 4-15 cm. Petiole narrowly grooved on the upper surface, 30-125 mm x 1.5 x 2 mm, glabrous. Pocket domatia usually present particularly towards the leaf base. Pale circular or slightly elongated lenticels normally visible on the twigs. Stipules very small.

Flowers

Inflorescences axillary up to 180 mm long, usually unisexual. Male and female flowers about 2 mm diam. Anthers shaped like a cloven hoof with the two anther sacs joined only towards the base; bases of the staminal filaments surrounded by numerous hairy 'glands'. Ovary pubescent.

Fruit

Fruit about 6-8 mm x 3.4-4 mm. Aril orange-red, completely enclosing the seed.

Seedlings

Cotyledons broadly elliptic to orbicular, about 10-15 x 10-17 mm. First pair of leaves narrowly ovate or lanceolate, margins toothed. Midrib raised on the upper surface. At the tenth leaf stage: oil dots very small, just visible with a lens; two small raised glands on the upper surface of the petiole near its junction with the leaf blade; stipules very small.

Distribution and Ecology

Occurs in WA, NT, CYP and NEQ. Altitudinal range from near sea level to 300 m. Favoured by disturbance, grows in well developed rain forest on a variety of sites. Also occurs in New Guinea.

Natural History

Not all specimens have domatia on the leaves, especially in Torres Strait.

WA

X

NT

X

CYP

X

NEQ

X

Shrub (woody or herbaceous, 1-6 m tall)

X

Tree

X

RFK Code

1170