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Acacia gemina

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Acacia gemina R.S.Cowan & Maslin, Nuytsia 12: 421–422 (1999)

Spreading, much-branched shrub 0.4–1. m high. Branchlets appressed-puberulous. Phyllodes patent to inclined, rarely slightly deflexed, narrowly oblong to oblong-oblanceolate or broadly elliptic, straight or recurved, mostly 10–25 mm long, 3–6 mm wide, rounded-obtuse and excentrically mucronulate, coriaceous, glabrous or appressed-puberulous on nerves, with 3 prominent, distant nerves on each face; gland 1–3 mm above pulvinus. Inflorescences simple, 1 or 2 per axil; peduncles 2–4 mm long, appressed-puberulous; basal bract caducous, cucullate, oblate, strongly 3-nerved; heads globular, 3–4 mm diam., 9–18-flowered, golden. Flowers 5-merous; sepals free. Pods linear, raised over and slightly constricted between seeds, strongly curved to openly once-coiled, to 5 cm long, 2 mm wide, firmly chartaceous or thin-crustaceous, nearly glabrous. Seeds longitudinal, ovate-elliptic, 2 mm long, dull, black; aril subapical.

Poorly known species, occasional in the Boyagin Rock Reserve near Brookton and the Saddleback Timber Reserve near Boddington with two outlying populations, one near Narrogin, the other near Hyden in south-western W.A. Grows in open heath dominated by Dryandra carduacea or in Eucalyptus drummondii low woodland in laterite-gravel.

Nearest to A. deflexa which has patent hairs on its puberulous branchlets and peduncles, commonly deflexed phyllodes with the gland situated at the distal end of the pulvinus and nerveless basal peduncular bracts. Both species are probably a part of the ‘ A. sulcata group’, near A. nitidula and A. dura in particular.

Type of accepted name

Tunnell Rd, 0.2 km SE of Forty- Hollow Rd, Mt Saddleback, W.A., 29 Aug. 1980, A.S.Weston 12667 ; holo: PERTH; iso: K.

Representative collections

W.A.: near Narrogin, Mar. 1938, W.E.Blackall s.n. (PERTH); W margin of Boyagin Rock Reserve near entrance, R.S. & R.A.Cowan A867 (MEL, NSW, PERTH); Worsley Mine Site, 10 km S of Boddington, J.M.Koch JK148 (PERTH); 35 km E of Billericay [near Hyden], K.Newbey 3236 (MEL, PERTH).

(RSC)

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