Acacia elongata

Acacia elongata, also known as swamp wattle[1][2] or slender wattle,[3][2] is a shrub of the genus Acacia and the subgenus Plurinerves that is endemic to coastal areas of eastern Australia.

Swamp wattle
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Clade: Mimosoideae
Genus: Acacia
Species:
A. elongata
Binomial name
Acacia elongata
Sieber ex. DC.
Occurrence data from AVH

Description

The shrub or small tree typically grows to a height of around 1 to 7 m (3 ft 3 in to 23 ft 0 in) and has an upright and open habit.ref name=anps/> with hairy, yellow-ribbed angular branchlets. Like most species of Acacia it has phyllodes rather than true leaves. The glabrous, thinly coriaceous and evergreen phyllodes have a narrowly linear or occasionally linear-oblanceolate shape are usually mostly incurved. The phyllodes are 4 to 17 cm (1.6 to 6.7 in) in length and 1 to 7 mm (0.039 to 0.276 in) wide and have three raised distant nerves.[3] It blooms between July and October producing inflorescences that appear in groups of one to three, or sometimes as many as seven, on an axillary axis that is 1 to 15 mm (0.039 to 0.591 in) in length. Sometimes these will appear in the axils of the phyllodes. The spherical flower-heads have a diameter of 5 to 10 mm (0.20 to 0.39 in) and contain between 20 to 40 lemon yellow to bright yellow coloured flowers.[1] Following flowering it produces straight, thinly leathery to firmly papery, brittle seed pods that are flat but are raised over each of the seeds. The pods are 3 to 11.5 cm (1.2 to 4.5 in) in length and 3 to 5 mm (0.12 to 0.20 in) wide with sparsely distributed hairs.[1]

Taxonomy

The species was first formally described by the botanist Augustin Pyramus de Candolle in 1825 as a part of the work Leguminosae. Prodromus Systematis Naturalis Regni Vegetabilis. It was reclassified by Leslie Pedley in 2003 as Racosperma elongatum then transferred back to genus Acacia in 2006.[4] The type specimen was collected by Franz Sieber in 1823. It is closely related to Acacia ptychoclada and superficially resembles Acacia trinervata, Acacia dawsonii and Acacia viscidula.[2] The specific epithet is taken from the Latin word elongatus meaning lengthened in reference to the long, narrow phyllodes.[5]

Distribution

It is found down the east coast of Australia from around Kingscliff in the north of New South Wales down to around Eden in the south and inland to around Wagga Wagga in the west. Its range also extends into the eastern highlands region of Victoria although it has become naturalized in a few other localities in Victoria.[3] It is usually situated along watercourses and swamps[2] growing in sandy soils as a part of Eucalyptus or heathland communities.[1]

Cultivation

Although it is not a widely cultivated species smaller forms are sometime found in gardens. They grow quickly and flower within one or two years from seed. It is able to grow in a range of soils so long as they are reasonably moist and will manage in either full sun or dappled shade. It can be propagated by seed but requires pretreatment scarification or by soaking in boiling water.[5] The shrub is suitable for poorly drained areas, will tolerate light frosts and salt spray.[6]

See also

References
  1. "Acacia elongata Sieber ex DC". PlantNet. Royal Botanic Garden, Sydney. Retrieved 1 October 2020.
  2. "Acacia elongata Sieber ex DC., Prodr. 2: 451 (1825)". World Wide Wattle. Western Australian Herbarium. Retrieved 1 October 2020.
  3. "Acacia elongata Sieber ex DC". Wattle - Acacias of Australia. Lucid Central. Retrieved 30 September 2020.
  4. "Acacia elongata Sieber ex DC". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 1 October 2020.
  5. "Acacia elongata". Australian Native Plant Society. Retrieved 1 October 2020.
  6. "Acacia elongata Swamp Wattle". Wattle - genus Acacia. Australian National Botanic Gardens. Retrieved 1 October 2020.
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