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Acacia obesa

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Acacia obesa R.S.Cowan & Maslin, Nuytsia 10: 252 (1995)

Spreading shrub mostly 0.3–0.6 m high. Branchlets terete, tomentulose, occasionally appressed-puberulous. Phyllodes mostly shallowly to strongly incurved but sometimes a few straight, terete, mostly 1.5–2.5 cm long, 1.2–1.75 mm diam., rounded-obtuse, often minutely mucronulate, normally thick, usually glabrous, strongly striate by 12–16 fine, raised nerves. Infloresences simple; heads sessile, globular, 3.5–4 mm diam., 9–14-flowered, light golden. Flowers 5-merous; sepals 2/3–3/4- united. Pods linear, strongly curved, becoming 1- or 2-coiled after dehiscence, biconvex, 2–4 cm long, 2–2.5 mm wide, coriaceous, glabrous except puberulous basally or generally puberulous. Seeds longitudinal, quadrate-rotund, 1.5–1.8 mm long, glossy, mottled shades of tan; aril nearly as long as seed.

Occurs in a restricted area near Lake Grace, Hyden and Lake King, W.A. Grows in sand and gravelly loam, in low open woodland, open scrub and open heath.

A variant from along the Kulin Road north of Lake Grace ( B.R.Maslin 4070 , PERTH), has the phyllodes loosely tomentulose at first but glabrescent, and the pods generally puberulous; all the other collections have glabrous phyllodes except for the pulvini which have an indumentum as on the branchlets.

Related to A. dielsii which is distinguished most readily by its pods and exarillate seeds, peduncles 2-4 mm long, branchlets commonly glabrous and phyllodes more slender. Also superficially similar to A. pinguiculosa subsp. teretifolia which has 6-nerved, weakly curved phyllodes, pedunculate heads and differently shaped, smaller seeds. Acacia arcuatilis also superficially resembles A. obesa but is readily distinguished by its 8-nerved phyllodes, 4-merous flowers and straight, narrower pods.

Type of accepted name

21 miles [33.6 km] E of Hyden, W.A., 14 July 1970, B.R.Maslin 550 ; holo: PERTH; iso: BRI, CANB, K, MEL, NY.

Representative collections

W.A.: 27 km N of Lake Grace towards Kulin, B.R.Maslin 4070 (PERTH); 1 km S of Lake King township, P.G.Wilson 6940 (NSW, 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 21 July 2020