A small tree, much branched; branches rigid, leafy branches often ending in stiff pungent spines; bark glabrous, lenticelled; buds perulate; leaves membranous, distinctly petioled, oblong-ovate or-elliptic, obtuse, base rounded, margin bluntly rather wide-crenate, 1-2 1/4 in. long, 2/3-1 in. wide, glabrous on both surfaces, clustered at the apices of short lateral twigs along the branches; twigs densely or loosely clothed with subimbricating rigid ovate-acute scales; petiole 1/4-3/4 in. long, sparingly pubescent; stipules small; inflorescence 2-sexual, with a solitary terminal jointed female flower and with rather distant clusters of male flowers downwards; spikes solitary, geminate or ternate, mixed with the leaves at the tips of the scaly twigs, 2/3-1 1/4 in. long; rhachis white-puberulous; bracts all minute; male several-flowered, ovate, acute; male buds glabrous, distinctly pedicelled; female calyx 4-6-partite; lobes ovate, acute; ovary distinctly 3-celled, harshly puberulous; styles 3, free to the base, laciniate; seeds globose.
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Very like A. acrogyna, but a thorny shrub with stout branches and grey bark, with the leaves usually obtuse or rounded at the apex.
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