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Acacia sibilans

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Acacia sibilans Maslin, Nuytsia 4: 402; 403, fig. 11, 405, fig. 12 & 408, fig. 14 (1983)

Whispering Myall

Silvery, speading tree 3–7 (- 12) m high; branches often slightly twisted and spreading horizontally. Bark fibrous, grey. Branchlets appressed-puberulous, glabrescent. Phyllodes ascending to erect, filiform, straight to shallowly curved to sinuous, terete, (8- ) 10–18 cm long, 0.8–1 mm diam., with curved to uncinate apex, not rigid, silvery appressed-puberulous early but hairs confined to between nerves with age, finely multistriate. Inflorescences 2- or 3-headed racemes; raceme axes 0.5–1.5 mm long; peduncles 5–12 mm long, silvery appressed-puberulous; heads globular, 5 mm diam., 26–28-flowered, golden. Flowers 5-merous; sepals free; petals pale yellow or silvery appressed-puberulous. Pods pendulous, moniliflorm, to 20 cm long, 7–10 mm wide, crustaceous, finely longitudinally nerved, hoary when young, ageing glabrescent except between seeds. Seeds longitudinal, compressed-elliptic, 9–12 mm long, dull, dark brown; aril small, pale yellow.

Scattered from Shark Bay inland to near Mileura Stn, also from Roy Hill, c. 500 km N of Mileura Stn, north-western W.A. Grows on plains and alluvial flats in shallow loam and sand over limestone, in low chenopodiaceous shrubland and, further inland, in Acacia shrubland.

Closely related to A. auripila . Also related to A. papyrocarpa , which has chartaceous, flat pods with smaller seeds, smaller flower-heads and generally shorter, straighter, subterete to flat phyllodes. Phyllodes sometimes resemble those of A. coriacea which is readily distinguished by its united sepals and large, bright orange seed arils.

Type of accepted name

29 miles [46.5 km] N of The Overlander [Roadhouse] (Denham turnoff), North West Coastal Hwy, W.A., 9 Sept. 1970, A.S.George 10360 ; holo: PERTH; iso: CANB, K, MEL, PERTH.

Illustrations

B.R.Maslin, op. cit . 403, fig. 11 & 405, fig. 12.

Representative collections

W.A.: 26.5 km N of Tropic of Capricorn beside North West Coastal Hwy, 28 Nov. 1983, W.Edgecombe (PERTH); c. 15 km S of Roy Hill Stn on Great Northern Hwy, B.R.Maslin 5271 (BRI, CANB, K, PERTH); Austin Downs Stn near Cue, A.A.Mitchell 902 (BRI, MEL, NY, 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