Description: Trees, hairy or glabrous, monoecious.
Leaves alternate, simple or paripinnate with leaflets mostly opposite, smallest ones often towards base of leaves; laminas with margins entire or toothed.
Inflorescences in upper axils, mostly racemose or paniculate. Flowers unisexual. Calyx tube shallow, usually 4–6-lobed. Petals absent, or 4 or 5, shortly clawed, scales crestless. Disc complete. Stamens 5–10; filaments shorter than anthers. Ovary 2–4-locular; 1 ovule per loculus.
Fruit usually 1–4-lobed, lobes mostly globose or sometimes compressed, 1-seeded; pericarp thin and drying ± crustaceous, splitting irregularly; seeds ± globose; aril cupular, granular or occasionally smooth.
Distribution and occurrence: World: c. 34 species, Hawaiian Is, Philipp., Indon., N.C., New Guinea, New Zealand, Australia. Australia: 13 species (12 species endemic), Qld, N.S.W., W.A. [includes Heterodendrum]
Text by G.J. Harden
| ||Key to the species|| |
|Leaves compound, paripinnate with 2 or more leaflets||3|
|2||Leaves usually more than 8 times as long as wide, margins always entire||Alectryon oleifolius|
|Leaves usually less than 8 times as long as wide, at least some leaves with margins irregularly toothed|
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|4||Leaves with usually 2 or rarely 4 or 6 leaflets, discolorous with lower surface pale grey-green||5|
|Leaves usually 4–6 or sometimes 2 leaflets, both surfaces more or less dark green|
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|5||Apex of leaflets obtuse; confined to rainforest and scrub near the sea||Alectryon coriaceus|
|Apex of leaflets shortly acuminate; in dry rainforest and scrub in the escarpment gorges and Western Slopes|
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|6||Leaves, branchlets and fruit glabrous or finely pubescent; leaflets 2–6; fruit usually 2-lobed||7|
|Leaves, branchlets and fruit rusty-tomentose; leaflets 4–8; fruit usually 3-lobed|
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|7||Leaflets usually more than 2 times as long as wide; lobes of fruit globose, glabrous; apex of leaflets mostly acuminate||Alectryon subcinereus|
|Leaflets less than 2 times as long as wide; lobes of fruit more or less compressed at margins, hairy; apex of leaflets obtuse to more or less acute|
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