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Acacia echinula

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Acacia echinula DC., Prodr . 2: 449 (1825)

Hedgehog Wattle

Intricate shrub to 2 m high. Branchlets hirsutellous to puberulous. Stipules normally setaceous, 1–2 mm long. Phyllodes rather crowded, subsessile, often subverticillate, patent to inclined, terete or subterete, often drying quadrangular or flat with a pronounced midrib on each face, 5–14 mm long, 1–1.5 mm wide, pungent, rigid, green, glabrous; gland obscure, 0.5–2 mm above base. Inflorescences simple, 1 per axil; peduncles 5–15 mm long, stout, glabrous; basal bracts 3 and fused; heads globular, large, 5–10 mm diam. (dry), densely 27–42-flowered, usually mid-golden; bracteole laminae long-acuminate, 1.5–2 mm long, dark brown, exserted beyond flowers in bud. Flowers 5-merous; sepals 1/3–2/3-united; petals 1-nerved. Pods to 4 cm long, 4–5 mm wide, thinly coriaceous-crustaceous, blackish, glabrous. Seeds longitudinal, oblong-elliptic, 4 mm long, dark brown, obscurely mottled yellow, exarillate; funicle filiform.

Occurs in eastern N.S.W. between Howes Valley and Nowra, also further N near Grafton. Usually grows in sand over sandstone, in dry sclerophyll forest or sometimes in heath.

A member of the ‘ A. ulicifolia group’ recognised by its long, stout (0.5–1 mm diam.) peduncles, large flower-heads (5–10 mm diam. when dry), long-acuminate, exserted bracteoles and quadrangular phyllodes (when dry). Especially close to A. asparagoides . The flower-heads are usually a bright mid-golden, but sometimes they are a lighter shade of yellow (e.g. B.R.Maslin 5886 , K, NSW, PERTH), although not a creamy yellow as in A. ulicifolia . May form hybrids with A. ulicifolia (see discussion under A. ulicifolia ).

Type of accepted name

Australia [N.S.W.], Sieber 447 ; holo: G-DC; iso: K, MEL, NSW.

Synonymy

Acacia echinata Don, Gen. Hist. 2: 402 (1832), nom. illeg. (superfluous). Type: as for accepted name.

Illustrations

I.B.Armitage, Acacias New South Wales 15 (1978); M.Simmons, Acacias Australia 2: 27 & pl. 7 (1988); T.Tame, Acacias SE Australia 98, fig. 92, pl. 92 (1992).

Representative collections

N.S.W.: between Putty and Windsor, 8 Sept. 1948, E.F. Constable s.n. (NSW, PERTH); Bunyabba Nature Reserve, c. 25 km N of Grafton, R.Coveny 4987 (NSW); Blue Mtns Natl Park, 20 km SW of Bilpin on Bells Line of Rd to Lithgow, B.R.Maslin 5880 (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.

Page last updated: Tuesday 11 September 2018