Acacias of Australia

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Acacia yirrkallensis Specht




Occurs in northern N.T. in Arnhem Land N of Edith Falls (14º11'S) and E to the Gulf of Carpentaria.


Shrub to 1 (–2) m high, erect or prostrate, resinous, branching near ground. Bark smooth, dark grey to dark brown. Branchlets angular, brown to dark red-brown or yellowish, glabrous; ridges often minutely resin-crenulated. Phyllodes very narrowly elliptic, narrowly elliptic-oblong to linear, straight to slightly curved, 1.5–4.5 cm long, 1.4–3 (–5.2) mm wide, thinly coriaceous, with prominent stomata, with 1 ±prominent main nerve and sometimes 2 ±subprominent nerves; minor nerves indistinct, parallel, sometimes sparingly ±anastomosing; gland basal, inconspicuous, 1–2 mm above pulvinus. Heads 3–4.5 mm diam., yellow. Flowers 10–13 per head, 5-merous; calyx 0.9–1.1 mm long, almost free, glabrous; corolla 1.4–1.6 mm long, dissected to 1/3–1/2, glabrous; ovary glabrous. Pods oblanceolate to narrowly oblanceolate, basally narrowed, straight-sided, flat, 2–5 cm long, (4–) 7–9 (–13) mm wide, thinly woody, obliquely striate; margins and seed-partitions prominent. Seeds oblique, oblong-elliptic, 2.5–3.5 mm long, brown to dark brown; pleurogram with halo; areole elongate, open, dark brown; funicle-aril narrowly turbinate.


Flowers June–Jan.


Grows usually in grey sandy podsols on stony sandstone ridges and gorges, in eucalypt forest or woodland, and on laterite and bauxite.


N.T.: Wessel Is., P.K.Latz 3399 (BRI, CANB, DNA, MEL, NSW); 3 km N of Yirrkala turnoff to Nhulunbuy road, D.Keith & B.Pellow 189 (NSW, SYD); Cato R., Arnhem Bay, F.Duncan (Cato 2) (NSW); c. 55 miles [88.5 km] W of B.H.P. Camp, J.R.Maconochie 1563 (BRI, CANB, DNA, MEL, NSW, PERTH); c. 68 miles [109.5] km NE of Maranboy Police Stn, M.Lazarides & L.Adams 94 (BRI, CANB, DNA, K, NSW).


A large pod variant (12–13 mm wide) occurs in inland sandstone areas, e.g. J.Russell-Smith 5223 & D.Lucas (DNA, PERTH).

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 J.Rogers

Dr M.D.Tindale and Dr P.G.Kodela with the assistance of M.Bedward, S.J.Davies, C.Herscovitch, D.A.Keith and/or D.A.Morrison