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Acacia comans

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Acacia comans W.Fitzg., J. W. Australia Nat. Hist. Soc . 1: 5 (1904)

Spreading shrub 0.3–2 m high. Branchlets terete, slightly ribbed, densely puberulous to pubescent with straight, spreading hairs. Stipules persistent, acicular, 1.5-2.3 mm long. Phyllodes sessile, patent, widely elliptic to oblong, inequilateral, 3.5–9 mm long, 1.5–5 mm wide, pungent, rigid, the 3 or 4 distant, raised main nerves sparsely to densely hairy or glabrous; gland on upper margin, 1.5–3.5 mm from base. Inflorescences simple, 1 or 2 per axil; peduncles 5–10 mm long, normally glabrous; heads usually globular, 4–4.5 mm diam., 25–36-flowered, yellow. Flowers 5-merous; sepals free. Pods linear, raised over seeds, straight, to 4.5 cm long, 4–5 mm wide, coriaceous, with indumentum usually as on branchlets, normally with a faint, light-coloured, longitudinal midline on each valve. Seeds longitudinal, broadly oval to subcircular, turgid, 3 mm long, mottled, brown; aril subapical to lateral, helmet-shaped.

Occurs from the Geraldton area to SW of Coorow, W.A. Grows in sandy soil.

Acacia comans is close to A. latipes , which differs in having caducous stipules and normally longer phyllodes, and to A. adnata , from which it is distinguished (perhaps somewhat arbitrarily) by its patent branchlet hairs and normally pilose pods (but see variants below). One specimen ( B.R.Maslin 6586 , PERTH) has obloid heads and another ( F.W.Went 230 , PERTH) has immature pods which are sparsely appressed-hairy.

The above description does not take into account the following two variants which, although seemingly referrable to A. comans as currently understood, need to be reassessed in the light of additional fruiting material and also a reassessment of A. latipes (which as currently defined is exceedingly polymorphic). The variants are distinguished by a number of features.

The first variant has branchlets with spreading hairs; phyllodes generally bigger (5–14 mm long), with the young phyllode nerves or margins shortly hairy, often glabrescent; and, pods sparsely appressed-hairy when young, glabrous at maturity. This variant is close to some forms of A. latipes , from which it differs in its persistent stipules. It occurs in the Moresby Ra., N of Geraldton and 16 km N of Northampton, W.A. (e.g. Howatharra Hill Reserve, Moresby Ra., D. & N.McFarland 1004 , PERTH)

The second variant has branchlets with appressed indumentum; phyllodes relatively long and narrow, 5–15 mm x 1.5–2.5 mm, glabrous; and, pods unknown. It is very close to some forms of A. latipes , from which it differs in its persistent stipules. It occcurs between 75 and 160 km N of Geraldton, W.A. (e.g. c. 16 km S of Murchison R. on North West Coastal Hwy, B.R.Maslin 2790 , BRI, NY, PERTH).

Type of accepted name

Arrino, W.A., Sept. 1903, W.V.Fitzgerald s.n. ; lecto: NSW216914, fide B.R.Maslin & R.S.Cowan, Nuytsia 9: 390 (1994); isolecto: NSW, PERTH00745189.

Representative collections

W.A.: Ebbano Well, E from Mingenew, 20 Sept. 1904, A.Morrison s.n. (NSW, PERTH); 11 km SW from Three Springs on road to Eneabba, B.R.Maslin 6415 (MEL, PERTH); 40 km from Brand Hwy towards Coorow, R.Cumming 1318 (PERTH).

(RSC & MAL)

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: Tuesday 11 September 2018