Acacias of Australia

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Acacia semiaurea Maiden & Blakely




Salient features of the syntypes are as follows: New shoots with dense, appressed, white to cream hairs. Phyllodes oblanceolate, 4.5–6 cm long, 13–16 mm wide, thinly coriaceous, 1‑nerved per face, with indumentum of ±sparse, appressed, white hairs; gland not prominent, 6–18 mm above pulvinus. Inflorescences 4–7-headed racemes; raceme axes 1.5–3 cm long, often growing out; heads globular.


Acacia semiaurea was treated under Doubtful Names by B.R.Maslin, Fl. Australia 11B: 444 (2001). The very few specimens seen which appear to match the types are of cultivated, or presumed cultivated, origin. Some of these possess pods which show the seeds to be half-encircled by dark reddish funicles. It is suggested by M.C.O’Leary, J. Adelaide Bot. Gard. 21: 99 (2007) that A. semiaurea may possibly be a hybrid involving A. argyrophylla and A. dictyocarpa (which was referred to as the appressed hairy variant of A. brachybotrya in that publication). The suggestion by B.R.Maslin, Fl. Australia 11A: 359 (2001) and in WATTLE Acacias of Australia CD-ROM (2001), that A. retinodes might be involved in this hybridity was incorrect.

Other specimens examined: Bot. Garden Adelaide, Anonymous 23 (MEL615111); Grass plt. on Schmitz [?] property opposite Monkey House, Anonymous 15 (MEL103740); without details except ‘No. 19. Plant’ (MEL103741).

FOA Reference

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