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Acacia adunca

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Acacia adunca A.Cunn. ex Don, Gen. Hist . 2: 406 (1832)

Wallangarra Wattle , Cascade Wattle

Bushy shrub or tree to 6 m high. Branchlets slender, dark reddish, glabrous. Phyllodes narrowly linear, 7.5–14 cm long, 1.5–2.5 mm wide, uncinate to subuncinate, not rigid, commonly finely wrinkled when dry, glabrous; midrib subimpressed; lateral nerves obscure or absent; gland not overly prominent, slightly exserted, 1–4 cm above pulvinus. Inflorescences 4–13-headed racemes; raceme axes 15–40 mm long, glabrous; heads showy, globular, subdensely 9–14-flowered, bright golden; bracteoles ±peltate, with laminae subcircular and golden- or white-fimbriolate; peduncles 3.5–6 mm long, glabrous. Flowers 5-merous; sepals united. Pods rounded on opposite sides over alternate seeds, to 13 cm ( - 18) long, 11–12 mm wide, thinly coriaceous, glabrous. Seeds longitudinal, oblong to elliptic, 5.5–6 mm long, somewhat shiny, blackish, arillate; funicle short.

Geographically restricted along the Great Divide from Bolivia Ra. N to Legume in north-eastern N.S.W., W to Amiens State Forest (36 km NW of Stanthorpe), in south-eastern Qld. Grows in elevated country, in woodland or forest, in sand or sandy loam over granite.

The complex nomenclatural history of the names A. adunca and A. linearifolia is discussed by B.R.Maslin, Telopea 6: 43 - 49 (1994). G.Bentham, Fl. Austral. 2:372 (1864), erroneously treated A. adunca as conspecific with A. crassiuscula . The nomenclature of A. hamiltoniana is linked to that of A. adunca and is discussed by L.Pedley, Austrobaileya 1: 286 (1980) and B.R.Maslin, loc. cit ..

Closely allied to A. betchei and A. linearifolia . Also resembling A. acrionastes , A. floydii and A. macnuttiana .

Type of accepted name

July 1827, A.Cunningham 79 ; neo: K, fide B.R.Maslin, Telopea 6: 46 (1994), the type is labelled Hunter R., N.S.W., but was probably collected from the Stanthorpe - Wallangarra area, Qld; isoneo: A, BM, K, NSW.

Synonymy

Acacia crassiuscula var. adunca (A.Cunn. ex Don) Benth., London J. Bot . 1: 356 (1842); Racosperma aduncum (A.Cunn. ex G.Don) Pedley, Austrobaileya 2: 344 (1987). Type: as for accepted name.

Acacia accola Maiden & Betche, Proc. Linn. Soc. New South Wales 31: 734 (1907). Type: Jennings [now Wallangarra], Qld, Dec. 1903, J.H.Maiden & J.L.Boorman ; lecto: NSW, fide B.R.Maslin, loc. cit. ; isolecto: PERTH; paralecto: see B.R.Maslin, loc. cit.

Illustrations

J.H.Maiden, Forest Fl. New South Wales 5: pl. 173K–M (1913); M.Simmons, Acacias Australia 2: 157 (1988); T.Tame, Acacias SE Australia 147, fig. 159, pl. 159 (1992).

Representative collections

Qld: Amiens, M.Bengston S134 (BRI); Bald Rock Ck, N of Wallangarra, E.J.Carroll & I.R.Telford 707 (CANB). N.S.W.: Shiny Ra., Bolivia, E.F.Constable 7089 (NSW, PERTH).

(BRM)

 

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.

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Page last updated: Tuesday 11 September 2018