Acacia lasiocalyx

Shaggy wattle
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Embryophytes
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Clade: Mimosoid clade
Genus: Acacia
Species:
A. lasiocalyx
Binomial name
Acacia lasiocalyx
Occurrence data from AVH
Synonyms[1]
  • Racosperma lasiocalyx (C.R.P.Andrews) Pedley
  • Acacia acuminata auct. non Benth.: Bentham, G. (5 October 1864) p.p.
  • Acacia doratoxylon auct. non A.Cunn.: Meisner, C.D.F. in Lehmann, J.G.C. (ed.) (1844) p.p.
  • Acacia signata auct. non F.Muell.: Diels, F.L.E. & Pritzel, E.G. (6 December 1904)
Habit near Wongan Hills

Acacia lasiocalyx, commonly known as silver wattle[2] and known by the Noongar peoples as wilyurwur,[3][4][5] is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is an open, often weeping, glabrous shrub, or sometimes a tree, with pendent, linear, leathery, more or less straight to curved phyllodes, spikes of densely arranged golden yellow flowers, and linear pods raised over the seeds and constricted between them.

Description

Acacia lasiocalyx is an open, often weeping, glabrous shrub that typically grows to a height of 1.5–7 m (5–23 ft), sometimes a tree up to 12 m (39 ft), its branchlets covered with a white, powdery bloom. Its phyllodes are leathery, linear, straight to curved, 130–300 mm (5.1–11.8 in) long, 2–10 mm (0.079–0.394 in) wide, the tips obviously curved, and finely striated with the midrib being the most prominent. The flowers are borne in spikes on paired peduncles 8–17 mm (0.31–0.67 in) long and covered with a powdery bloom, the spikes 20–40 mm (0.79–1.57 in) long and 6–7 mm (0.24–0.28 in) wide, with densely arranged golden yellow flowers. Flowering occurs from July to October, and the pods are linear, leathery, up to 160 mm (6.3 in) long, 4.5–5.5 mm (0.18–0.22 in) wide, straight to slightly curved and raised over the seeds and constricted between them. The seeds are elliptic, 5–6 mm (0.20–0.24 in) long and glossy dark brown.[5][6][7][2]

Taxonomy

Acacia lasiocalyx was first formally described in 1904 by Cecil Rollo Payton Andrews in the Journal of the Western Australian Natural History Society from specimens he found on sand plains near the Gairdner and "Hammersley" Rivers in 1903.[8][9] The specific epithet (lasiocalyx) means 'shaggy or woolly sepals'.[10]

Distribution and habitat

This species of wattle grows in gravelly, loamy or clayey sand and loam, often on the slopes of granitic hills and granite outcrop, but also on sandplains and in mallee woodland and heath and is widespread on the southwest of Western Australia from near Eneabba and Kalgoorlie and south to Bremer Bay and Mount Heywood north-east of Esperance, in the Avon Wheatbelt, Coolgardie, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Murchison and Swan Coastal Plain bioregions.[5][2][11]

Ecology

The tree is fibrous and copes well in arid conditions. It germinates prolifically after fire forming dense thickets of trees which are about 4 metres (13.1 ft) in height. These thickets thin out over the following decades, and trees my attain a height of 25 metres.[4]

See also

References

  1. 1 2 "Acacia lasiocalyx". Australian Plant Census. Retrieved 14 July 2026.
  2. 1 2 3 "Acacia lasiocalyx". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. ↑ "Noongar names for plants". kippleonline.net. Archived from the original on 2016-11-20. Retrieved 20 November 2016.
  4. 1 2 Stephen Hopper; Philippa Nikulinsky (2008). Life on the Rocks: The Art of Survival. Fremantle Press. ISBN 9781921361289.
  5. 1 2 3 Cowan, Richard S.; Maslin, Bruce R. "Acacia lasiocalyx". Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. Retrieved 16 July 2026.
  6. ↑ Maslin, Bruce R.; Cowan, Richard S. "Acacia lasiocalyx". Australian Biological Resources Study. Retrieved 16 July 2026.
  7. ↑ "Acacia lasiocalyx C.R.P.Andrews, J. Western Australia Nat. Hist. Soc . 1: 41 (1904)". WorldWideWattle. CSIRO. 15 December 2016. Retrieved 25 May 2017.
  8. ↑ Andrews, Cecil Rollo Payton (1904). "Additions to the West Australian Flora". Journal of the West Australian Natural History Society. 2 (1): 41. Retrieved 16 July 2026.
  9. ↑ "Acacia lasiocalyx". Australian Plant Name Index. Retrieved 16 July 2026.
  10. ↑ George, Alex S.; Sharr, Francis A. (2023). Western Australian Plant Names and Their Meanings - A Glossary (fifth ed.). Kardinya: Four Gables Press. p. 241. ISBN 9780645629538.
  11. ↑ Margaret G. Corrick, Bruce Alexander Fuhrer (2009). Wildflowers of Southern Western Australia. Rosenburg Publishing. ISBN 9781877058844.
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