Acacias of Australia

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Acacia adunca A.Cunn. ex G.Don

Common Name

Wallangarra Wattle, Cascade Wattle




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.


Bushy shrub or tree to 6 m high. Branchlets slender, dark reddish, glabrous. Phyllodes narrowly linear, 7–14 cm long, 1–2.5 mm wide, uncinate to subuncinate, not rigid, commonly finely wrinkled when dry, glabrous; midrib subimpressed; lateral nerves obscure or absent; gland 1 or occasionally 2, not overly prominent, slightly exserted, the lowermost 1–4.5 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 3–6 mm long, glabrous. Flowers 5‑merous; sepals united. Pods rounded on opposite sides over alternate seeds, to 13 (-18) cm long, 10–12 mm wide, thinly coriaceous, glabrous. Seeds longitudinal, oblong to elliptic, 5.5–6 mm long, somewhat shiny, blackish, arillate; funicle short.


Grows in elevated country, in woodland or forest, in sand or sandy loam over granite.


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).


Closely allied to A. betchei and A. linearifolia. Also resembling A. acrionastes, A. floydii and A. macnuttiana. Acacia adunca putatively hybridizes A. neriifolia in the Girraween NP, southeast Qld.

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, Telopea 6: 43–49 (1994).

FOA Reference

Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia


Minor edits by B.R.Maslin & J.Rogers