Acacias of Australia

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Acacia rigescens Tindale & Bedward




Known only from Kakadu Natl Park and Arnhem Land, N.T.


Shrub 0.6–3 m high, single-stemmed and spindly. Bark smooth, grey. New shoots viscid. Stipules persistent, c 1 mm long, reddish brown. Branchlets slightly angular towards apices, tawny to pale yellow, ±scurfy, glabrous. Phyllodes rigidly erect, linear, tapering gradually towards base, scarcely tapering towards apex with tip ±pungent, straight, flat, 4.5–8.5 cm long, 2–4 mm wide, coriaceous, glossy, dark green, ±glabrous except for scattered hairs on margins and prominent midnerve, scurfy; minor nerves 5–10 per mm, parallel; gland 1, basal, 2–4.5 mm above pulvinus. Inflorescences simple; peduncles 1–3 mm long, densely tomentulose; spikes single or in pairs, 2.5–3.5 cm long, golden. Flowers 5-merous; calyx 0.6–0.7 mm long, dissected almost to base, clothed with curled hairs; corolla 1.3–1.4 mm long, dissected to 1/3–1/2, glabrous; ovary densely clothed with curled or straight silvery hairs. Pods unknown.


Flowers June & July.


Gregarious and dense on sandstone plateaux with stony quartz surfaces, in low open eucalypt woodland and shrubland.


N.T.: 35 miles [56.4 km] SSE of Oenpelli, L.G.Adams 2785 (BRI, CANB, K).


Allied to A. conspersa which is distinguished most readily by its generally narrower, linear phyllodes and viscid new shoots.

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

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