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Acacia moirii

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Acacia moirii E.Pritz., Bot. Jahrb. Syst. 35: 312, 313, fig. 37 (1904)

Moir’s Wattle

Subshrub 0.15- 0.6 m high, commonly multistemmed. Branchlets rather rigid, the indumentum variable. Stipules spiny or scarious, 2- 8 mm long. Pinnae 1 pair, 5- 15 mm long, the apices often recurved; terminal seta often recurved and/or spiny; petiole 1- 2 mm long; pinnules 3- 7 pairs, oblong to narrowly oblong, sometimes ovate to lanceolate, 1.5- 6 mm long, sometimes 10 mm long (subsp. dasycarpa ), 1- 3 mm wide, asymmetrically narrowed at apex, green to glaucous, glabrous to densely hairy; gland at distal end of petiole, sessile. Inflorescences simple, 1 per axil; peduncles 5- 20 mm long, puberulous; heads globular, 15- 25-flowered, golden. Flowers 5-merous; sepals 3/4-united; petals 1-nerved. Pods to 4 cm long, 5- 6 mm wide, villous. Seeds transverse to oblique, oblong to elliptic or globose, 2- 3 mm long.

Precise affinities of A. moirii within sect. Pulchellae are not clear but it seems most closely related to the ‘ A. browniana group’, fide , P.Guinet et al. , Bot. J. Linn. Soc. 80: 53- 68 (1980).

Occurs in south-western W.A., from near Eneabba SE to Manypeaks and Jerdacuttup; also Cape Arid area, E of Esperance.

There are 3 subspecies.


1 Pinnules densely hairy on both surfaces; stipules not spiny; terminal seta and apex of pinna-rachis straight

subsp. dasycarpa

1: Pinnules glabrous or sparsely hairy on margins and/or lower surface; terminal seta and/or apex of pinna-rachis often recurved


2 Stipules spiny; pinnules nerveless or obscurely 1-nerved on lower surface

subsp. recurvistipula


2: Stipules not spiny; pinnules with a thickened midrib on lower surface

subsp. moirii


Acacia moirii E.Pritz. subsp. moirii

Branchlets antrorsely puberulous, sometimes also shortly pilose. Stipules 2- 4 mm long, slightly thickened. Pinnae 7- 10 mm long, the apices shallowly recurved, acute and sometimes subspiny; terminal seta usually recurved at apex, sometimes spiny; pinnules 3- 7 pairs, glabrous above except sparsely hairy on margins and often also lower surface, prominently 1-nerved below. Peduncles 8- 13 mm long.

Occurs from near Borden and Manypeaks E to Jerdacuttup, W.A. Grows in sand over laterite in tall shrubland.

Type of accepted name

‘in districtu Stirling prope Cape Riche, L.Diels 3458 , A.J.Moir’; ?iso: PERTH (Fragment ex B, labelled 4 km W of Cape Riche, 19 July 1901, L.Diels s.n. )


E.G.Pritzel, loc. cit. ; B.R.Maslin, Nuytsia 1: 418, fig. 7 & 486, map 5 (1975).

Representative collections

W.A.: 25 km S of Jerramungup, B.R.Maslin 2591 (CANB, PERTH); 5 km SSW of Draper Hill, K.Newbey 4208 (PERTH); 14.1 km SE of Jerdacuttup R. crossing on Ravensthorpe- Esperance road, M.D.Tindale 3816 (PERTH).


Acacia moirii subsp. dasycarpa Maslin, Nuytsia 1: 419; 419, fig. 8 & 486, map 5 (1975)

Branchlets densely pilose to villous. Stipules 4- 8 mm long, scarious. Pinnae 6- 15 mm long, the apices acute but not recurved or spiny; terminal seta scarious, straight to shallowly incurved; pinnules 3- 4 pairs, densely short-pilose with antrorsely curved hairs, 1-nerved below. Peduncles normally 15- 20 mm long.

Occurs from West R. to Jerdacuttup, also between Newdegate and Lake King, and Cape Arid, E of Esperance, W.A. Grows in deep sand and sand over laterite in tall open shrubland and, at E Mt Barren, in stony quartzite in heath.

Type of accepted name

3.4 km W of the Eyre Ra., W.A., 30 May 1970, K.Newbey 3175 ; holo: PERTH; iso: CANB, K, PERTH.


B.R.Maslin, loc. cit.

Representative collections

W.A.: between Lake King and Newdegate, T.E.H.Aplin 4532 (CANB, K, PERTH); Esperance- Cape le Grande area, M.Hancock 275 (NSW); c. 24 km NE of No Tree Hill, E Mt Barren area, B.R.Maslin 977 (K, MEL, NSW, PERTH).


Acacia moirii subsp. recurvistipula Maslin, Nuytsia 1: 258, fig. 3 & 259, fig. 4 (1972)

Occasionally semi-prostrate. Branchlets somewhat flexuose, usually antrorsely puberulous. Stipules spiny, 3- 6 mm long, recurved. Pinnae 5- 8 mm long, the apices flattened and straight or recurved; terminal seta straight or recurved, often spiny; pinnules 3- 5 pairs, glaucous to subglaucous, glabrous or sparsely hairy on margins and sometimes lower surface, nerveless or obscurely 1-nerved below. Peduncles 5- 15 mm long.

Scattered from Eneabba SE to Kukerin and Mt Madden, W.A. Grows in sand and lateritic soil, in tall shrubland and heath.

Branchlets are puberulous to shortly pilose with patent hairs on plants from the Badgingarra- Eneabba area. Elsewhere they are puberulous with distinctly antrorse hairs.

Type of accepted name

9 miles [14.5 km] N of The Humps (which is c. 16 km due NE of Hyden), W.A., 15 July 1970, B.R.Maslin 570 ; holo: PERTH.


B.R.Maslin, loc. cit. and Nuytsia 1: 421, fig. 9 & 486, map 5 (1975).

Representative collections

W.A.: NE of Mt Lesueur, E.A.Griffin 2531 (PERTH); 12.9 km N of The Humps, B.R.Maslin 569 (K, MEL, NSW, PERTH).


WATTLE Acacias of Australia CD-ROM graphic

The information presented here originally appeared on the WATTLE CD-ROM which was jointly published by the Australian Biological Resources Study, Canberra, and the Department of Parks and Wildlife, Perth; it was produced by CSIRO Publishing from where it is available for purchase. The WATTLE custodians are thanked for allowing us to post this information here.

Page last updated: Thursday 22 June 2023