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Acacia drewiana

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Acacia drewiana W.Fitzg., in J.H.Maiden, J. & Proc. Roy. Soc. New South Wales 51: 273 (1917)

Subshrub 0.2- 0.7 m high, commonly c. 0.3 m high. Branchlets flexuose, hirsutellous to puberulous, often shortly pilose admixed. Primary leaf axis clearly continuous and decurrent with branchlet, 5- 20 mm long, stout, straight to recurved; pinnae 2- 4 pairs, 2- 12 mm long; petiole absent; pinnules 2- 6 pairs, narrowly oblong, 2- 7 mm long, 1- 1.5 mm wide, recurved to revolute, green to glaucous, hirsutellous to subglabrous. Inflorescences simple, 1 per axil; peduncles 10- 20 mm long, hirsutellous to hirsute or shortly pilose; heads globular, large, densely 22- 35-flowered, golden. Flowers 5-merous; sepals united in lower 1/2, 1-nerved, the lobes ciliolate, additionally pilose in subsp. drewiana ; petals 1-nerved. Pods narrowly oblong, 3- 7 cm long, 6- 7 mm wide, crustaceous, shortly villous and often hirsutellous-puberulous admixed. Seeds (subsp. drewiana ) transverse to oblique, oblong to broadly elliptic, 3- 3.5 mm long, mottled.

Occurs in south-western W.A. from near Eneabba S to Mundijong, also Wongan Hills and Newdegate.

Acacia drewiana is distinguished from A. anarthros by its multijugate leaves, etc., see B.R. Maslin, Nuytsia 2: 354 (1979), for discussion. These two species are unique within sect. Pulchellae in having leaf axes continuous with the branchlets. Their relationship to other members of the section is uncertain, fide P.Guinet et al. , Bot. J. Linn. Soc. 80: 53- 68 (1980).

There are 2 subspecies.

Apex of pinna-rachis flattened; pinnules mostly 4- 7 mm long; calyx lobes ciliolate and with a few, additional very long hairs which are exserted in the buds

subsp. drewiana

Apex of pinna-rachis not flattened; pinnules 2- 4 mm long; calyx lobes ciliolate, lacking longer hairs

subsp. minor


Acacia drewiana W.Fitzg. subsp. drewiana

Terminal seta 2- 8 mm long; apex of pinna-rachis flattened and recurved; pinnules mostly 4- 7 mm long, green to grey-green, hirsutellous to subglabrous. Calyx lobes ciliolate and with a few, additional very long hairs which are exserted in the buds.

Occurs from near Eneabba S to Mundijong, W.A. Grows in sandy loam, sand, gravel and clay, sometimes in winter wet depressions, in heath and open Jarrah ( Eucalyptus marginata ) or Wandoo ( E. wandoo ) woodland.

Calyx indumentum similar to that found in A. plicata .

Type of accepted name

Cannington, W.A., Feb. 1905, W.V.Fitzgerald ; holo: NSW, fide B.R.Maslin & R.S.Cowan, Nuytsia 9: 397 (1994); iso: PERTH.


B.R.Maslin, Nuytsia 1: 473, fig. 31A- I (1975).

Representative collections

W.A.: SE of Eneabba, E.A. Griffin 3148 (PERTH); Mundijong, G.J.Keighery 4988 (PERTH); c. 3.4 km E of Muchea turn-off towards Lower Chittering, Great Northern Hwy, B.R.Maslin 3220A (B, K, MEL, MO, NY, PERTH); c. 10 km due NW of Dandaragan, B.R.Maslin 6031 (PERTH).


Acacia drewiana subsp. minor Maslin, Nuytsia 1: 474; 473, fig. 31L- O & 486, map 5 (1975)

Terminal seta 1- 2 mm long; apex of pinna rachis not flattened, straight or recurved; pinnules 2- 4 mm long, normally glaucous, hirsutellous. Calyx lobes ciliolate.

Disjunct, occurring at Wongan Hills and near Newdegate, W.A. Grows in sand, gravel, gravelly sand and sandy clay, in open heath, scrub and shrubland.

Type of accepted name

Lake Camm turn-off, Newdegate- Lake King road, W.A., 25 May 1963, A.S.George 4447 ; holo: PERTH; iso: CANB, NSW, PERTH.


B.R.Maslin, loc. cit .

Representative collections

W.A.: 17 km E of Newdegate towards Lake King, B.R.Maslin 3432 (CANB, PERTH); 3.5 km N of Wongan Hills, E.M.Scrymgeour 2095 (CANB, 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