Acacia oswaldii

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Boree
Acacia sessiliceps.jpg
A. oswaldii habit
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Clade: Mimosoid clade
Genus: Acacia
Species:
A. oswaldii
Binomial name
Acacia oswaldii
Acacia oswaldiiDistMap663.png
Occurrence data from AVH
Synonyms [1]

Acacia amaliae Domin
Acacia amaliae var. orthophyllaDomin
Acacia oswaldii var. abbreviata Benth.
Acacia sessilicepsF.Muell.
Racosperma oswaldii(F.Muell.) Pedley

Contents

A. oswaldii foliage 1 Acacia oswaldii foliage.jpg
A. oswaldii foliage
A. oswaldii seed pod Acacia sessiliceps fruit.jpg
A. oswaldii seed pod

Acacia oswaldii, commonly known as boree, [2] umbrella wattle, umbrella bush, whyacka, middia, miljee, nella and curly yarran, [3] is a shrub or tree of the genus Acacia and the subgenus Plurinerves.

Description

The shrub or tree typically grows to a height of 1 to 6 metres (3 to 20 ft) [4] and can be found to 8 m (26 ft). It has terete and glabrous branchlets with many red, resinous micro-hairs. Phyllodes are spreading to erect with leaves that are linear, narrowly elliptic or narrowly oblong-elliptic shape that is straight to recurved, terete to flat, 2.5 to 10.5 centimetres (1 to 4 in) in length and 3 to 15 millimetres (0.12 to 0.59 in) wide. [3] Leaves are hairy when young, becoming hairless, edges smooth, with a straight often sharp point. [5]

It blooms from October to December and produces yellow flowers. [4] The simple inflorescences forms singly or in pairs in the axil of the phyllodes supported on hairy peduncles that are 0 to 1 millimetre (0.00 to 0.04 in) long. The flowers are heads globose holding 5 to 16-flowers that are 5 to 8 mm (0.2 to 0.3 in) in diameter. Seed pods form later that are curved or coiled and mostly flat except where raised over seeds. The leathery to woody pods are 4 to 25 cm (1.6 to 9.8 in) long and 5 to 12 mm (0.2 to 0.5 in) wide. [6] Seeds can be collected from March to May and sown from November to February and will germinated in 3 to 10 weeks. A. oswaldii can also be grown from cuttings. [7]

Distribution

It is native to an area in the central and southern regions of South Australia and the Northern Territory, south west Queensland, western New South Wales, [6] northern Victoria [2] and the Pilbara and Goldfields-Esperance regions of Western Australia. [4]

The distribution is wide but scattered throughout arid, semi-arid and subtropical areas in all states on the mainland, occurring mainly in calcareous sands or loamy soils. [3]

Classification

The species was initially described by the botanist Ferdinand von Mueller in 1863 in the journal Fragmenta Phytographiae Australiae . [2] Several synonyms are known including Racosperma oswaldii, [6] Acacia sessiliceps, Acacia amaliae var. amaliae, Acacia osswaldi, Acacia amaliae, Acacia oswaldi var. abbreviata and Acacia amaliae var. orthophylla. [2]

The name honours Ferdinand Oswald, who was involved with the collection of the type specimen. [6] The type specimen was collected by von Mueller in 1851 near Blanchetown on the Murray River. [3]

See also

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References

  1. "Acacia oswaldii F.Muell. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2020-01-26.
  2. 1 2 3 4 "Acacia oswaldii F.Muell. Boree". The Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 18 July 2016.
  3. 1 2 3 4 "Acacia oswaldii". Worldwidewattle. CSIRO . Retrieved 18 July 2016.
  4. 1 2 3 "Acacia oswaldii". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  5. "Acacia oswaldii factsheet" . Retrieved 18 July 2016.
  6. 1 2 3 4 "Acacia oswaldii F.Muell". PlantNET. Royal Botanic Gardens, Sydney. Retrieved 12 December 2016.
  7. "Acacia oswaldii Umbrella Wattle". Tree Project Inc. Retrieved 18 July 2016.