Acacia dilatata

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Acacia dilatata
Acacia dilatata.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Clade: Mimosoid clade
Genus: Acacia
Subgenus: Acacia subg. Phyllodineae
Species:
A. dilatata
Binomial name
Acacia dilatata
Acacia dilatataDistMap292.png
Occurrence data from AVH
Synonyms [1]

Racosperma dilatatum(Benth.) Pedley

Acacia dilatata is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is a sprawling or compact, multistemmed shrub with leathery phyllodes with one edge straight and the other edge convex, spherical to oval heads of golden yellow flowers and curved, terete, crusty pods.

Contents

Description

Acacia dilatata is a sprawling or compact, multistemmed shrub that typically grows to a height of 30–70 cm (12–28 in) and has branchlets that are usually covered with soft hairs. The phyllodes are leathery, dark green or yellow-green, usually 10–20 mm (0.39–0.79 in) long, 7–10 mm (0.28–0.39 in) wide and sharply pointed. One edge of the phyllodes is often conspicuously rounded and more or less parallel to the branchlet and the other edge straight. The midrib is very close to the straight edge, and there are rigid, often spiny stipules at the base of the phyllodes. The flowers are borne in a spherical to oblong head in axils on a peduncle 5–10 mm (0.20–0.39 in) long, each heads with 15 to 25 golden yellow flowers. Flowering occurs during summer, and the pods are curved, terete, up to about 55 mm (2.2 in) long, 4.0–5.5 mm (0.16–0.22 in) wide, dark reddish brown, crusty and usually covered with fine, soft hairs. The seeds are oblong, 4.8–5.5 mm (0.19–0.22 in) long and brown with a conical aril on the end. [2] [3] [4] [5]

Taxonomy

Acacia dilatata was first formally described in 1855 by George Bentham in the journal Linnaea from specimens collected by James Drummond. [6] [7] The specific epithet (dilatata) means 'widened', referring to the phyllodes that widen upwards. [8]

Distribution

This species of wattle found on found on sandplains, clay flats and rocky lateritic ridges growing in sandy or clay soils in scattered populations from Mingenew south to Mogumber, 30 km (19 mi) west of Wongan Hills and near Darkin Swamp about 35 km (22 mi) south-west of York, in heath or low shrubland, [3] in the Avon Wheatbelt, Geraldton Sandplains, Jarrah Forest, Mallee and Swan Coastal Plain bioregions of south-western Western Australia. [5]

Conservation status

Acacia dilatata is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions. [5]

See also

References

  1. 1 2 "Acacia dilatata". Australian Plant Census. Retrieved 5 October 2025.
  2. ↑ Maslin, Bruce R. Kodela, Phillip G.; Orchard, Anthony E. (eds.). "Acacia dilatata". Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. Retrieved 5 October 2025.
  3. 1 2 "Acacia dilatata". World Wide Wattle. Western Australian Herbarium . Retrieved 22 April 2019.
  4. ↑ "Acacia dilatata". Australian Biological Resources Study. Retrieved 5 October 2025.
  5. 1 2 3 "Acacia dilatata". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  6. ↑ "Acacia dilatata". APNI. Retrieved 5 October 2025.
  7. ↑ Bentham, George (1855). "Plantae Muellerianae: Mimoseae". Linnaea: ein Journal für die Botanik in ihrem ganzen Umfange, oder Beiträge zur Pflanzenkunde. 26 (5): 608. Retrieved 5 October 2025.
  8. ↑ George, Alex S.; Sharr, Francis A. (2023). Western Australian Plant Names and Their Meanings - A Glossary (fifth ed.). Kardinya: Four Gables Press. p. 186. ISBN   9780645629538.
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