Acacia macradenia Benth.

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Specimens

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Common Name

Zig-zag Wattle.

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Description

Shrub or tree 3–5 m high. Branchlets pendulous to subpendulous, flexuose, glabrous. Stipules to 5 mm long, reflexed, indurate at maturity. Phyllodes patent to reflexed, narrowly elliptic to ± narrowly oblong, 13–25 cm long, (0.8–) 1–2.5 (–5) cm wide, narrowed and curved at base, commonly acuminate, glabrous; midrib prominent and contiguous with abaxial margin near base; lateral veins diverging widely from midrib and anastomosing; gland 0–10 (–15) mm above pulvinus, elongate, sometimes with 1 or 2 additional smaller glands above middle. Inflorescences 8–15-headed racemes, prolific in upper axils; raceme axes 2–5 cm long, glabrous; peduncles 3–6 mm long, ± glabrous; heads globular, densely 35–50-flowered, golden. Flowers 5‑merous; sepals c.¾-united. Pods to 12 cm long, 5–6 mm wide, thinly coriaceous, glabrous. Seeds longitudinal, ± oblong, c. 4 mm long; funicle-aril about as long as seed.

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Biostatus

Native and naturalised.

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Distribution

Widespread in southeastern Queensland from Clermont to Surat with a northern outlier at Torrens Creek, NE of Hughenden.

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Habitat

Grows in stony and sandy soil, often near creeks, in woodland or sometimes vine thicket.

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Representative Herbarium Specimens

Qld: 34.9 km along highway from Morven to Roma, N. Hall 82/18 (NSW, PERTH); Blackdown Tableland, 19 km SSE of Bluff, R.W. Johnson 1013 (BRI); Alpha–Tambo, J. & M. Simmons 1103 (PERTH).

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Uses

A decorative species, common in cultivation in eastern Australia.

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Nomenclature and Typification

Acacia macradenia Benth., in T.L. Mitchell, Journal of an Expedition into the Interior of Tropical Australia: 360  (1848); Racosperma macradenium (Benth.) Pedley, Austrobaileya 2: 352 (1987). Type: none cited; lecto (as holo): bed of rivers, subtropical New Holland [Maranoa River, near ‘Forest Vale’ HS, Qld], 31 Aug. 1846, T.L. Mitchell ‘296’, K, n.v., designated by L. Pedley, Austrobaileya 1: 269, 1980; probable isolecto: NSW.

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Taxonomic Notes

Hybrids between Acacia macradenia and A. bancroftiorum are noted by L. Pedley, Austrobaileya 1: 95 (1978) and 1: 275 (1979). These hybrids resemble A. holotricha, an uncommon species distinguished by its overall denser indumentum. Hybrids between A. macradenia and A. fimbriata are known in cultivation (e.g. B.R. Maslin 6094, PERTH). The pods and seeds described by G. Bentham, Flora Australiensis 2: 362 (1864), under A. macradenia are those of A. fasciculifera, according to F.J.H. von Mueller, Southern Science Record 2(7): 150 (1882).

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Illustrations

F.J.H. von Mueller, Iconography of Australian Acacia and Cognate Genera dec. 5 [pl. 7] (1887); M. Simmons, Acacias of Australia 177 (1981); G. Lithgow, 60 Wattles of the Chinchilla and Murilla Shires 55 (1997); A.E. Orchard & A.J.G. Wilson (eds), Flora of Australia 11A: 257, fig. 12E–G (2001); Acacia macradenia in World Wide Wattle (accessed 25 April 2024).

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Bibliography

Lithgow, G. (1997). 60 Wattles of the Chinchilla and Murilla Shires. (Muriel Grace Lithgow: Chinchilla).

Maslin, B.R. (2001). Acacia macradenia, pp. 256–258, in A.E. Orchard & A.J.G. Wilson (eds), Flora of Australia Volume 11A, Mimosaceae, Acacia part 1. (ABRS: Canberra / CSIRO Publishing: Melbourne).

Pedley, L. (1983). Mimosaceae, pp. 332–386, in T.D. Stanley & E.M. Ross, Flora of South-eastern Queensland Volume 1. (Queensland Department of Primary Industries: Brisbane).

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Source

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

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Characters

From the Acacia characters species list, created by on Mar 12, 2015.
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© Copyright Commonwealth of Australia, 2024
Last updated: Unknown; Feb 29, 2024 12:32 Status: Legacy

Author - B.R. Maslin

Editor - P.G. Kodela

Contributor - J. Rogers (minor edits, June 2012)

Acknowledgements -

Cite this profile as: B.R. Maslin. Acacia macradenia, in P.G. Kodela (ed.), Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. https://profiles.ala.org.au/opus/foa/profile/Acacia%20macradenia [Date Accessed: 15 March 2025]