Citation: B. R. Maslin, Nuytsia 6:36-39 (1987).

Derivation: The name commemorates Mr N. Hall a long time member of the Division of Forestry & Forest Products, CSIRO, Canberra.

Synonymy: Acacia iteaphylla, Acacia microcarpa

Common name: None

Description:
Bushy, spreading, domed or procumbent shrub to 2.5 m high and 4-5 m wide. Branchlets slightly to prominently angled at extremities, terete below, glabrous or usually with sparse or dense, short, straight, antrorsely-appressed fine pale hairs, new shoots usually densely hairy. Bark grey or brownish-grey, fibrous towards base of main branches.

Phyllodes usually asymmetric, upper margin more convex than the lower one, oblanceolate or narrow oblong to narrowly elliptic, 3-7 cm long, 4-15 mm wide, coriaceous, apices often slightly recurved and with sometimes slightly pungent mucro 1-2 mm long, finally glabrous but with short, straight, pale, appressed hairs when young, midrib prominent, lateral veins obscure. Gland on upper margin 5-12 mm above pulvinus, not prominent.

Peduncles axillary or rarely 1-2 on very reduced raceme, 2-(3-4) per node, 3-5 mm long, glabrous, often drying dark brown. Flower-heads globular, 9 mm diameter when fresh, mid-golden, 35-55-flowered, flowers 5-partite.

Legumes sub-moniliform, twisted loosely and irregularly, to 6 cm long, 3 mm wide, up to 10 seeds, glabrous or sparsely hairy, black. Seeds longitudinal, oblongoid to ellipsoid, 3-4 mm long, 2-2.5 mm wide, shiny to dull brown. Funicle filiform, about 2 mm long; aril conical at apex of seed 2-2.5 mm long to 2 mm wide at base, creamy to brownish.

Distribution:  The species, previously compounded with A. microcarpa, occurs in S.A., N.S.W. and Vic. In South Australia it occurs on Eyre Peninsula from near Pt Lincoln to Kimba, rarely in the Gawler Ranges, in northern Yorke Peninsula through the northern Lofty region and eastwards to Waikerie and Gluepot Station, thence Lameroo-Pinnaroo to the Victorian Border. It favours flat or undulating topography of red-brown sands and light calcareous soils with mallee eucalypts. Recently collected on Kangaroo Island. S.Aust.: EP, NL, MU, YP, SL. Flowering time: The species has been collected in flower between August and (principally) October and in pod in December.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Related taxa: Acacia halliana is closely related to A. merrallii from which it is distinguished by its much longer phyllodes. It has been much confused with A. microcarpa from which it differs in its larger more persistent stipules, acute and eglandular hairy phyllode apices and conical aril confined to the seed apex.

The species is described and discussed by Maslin (1987).

Cultivation: Acacia halliana is very attractive in flower and could make a showy spreading shrub 1 x 2 m.

Author: Not yet available

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