Acacia disticha

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Acacia disticha
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
Species:
A. disticha
Binomial name
Acacia disticha
Acacia distichaDistMap299.png
Occurrence data from AVH
Synonyms [1]
  • Acacia aff. myrtifolia[P34] (A.S.George 10588)
  • Racosperma distichum(Maslin) Pedley

Acacia disticha is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is glabrous, spreading shrub with phyllodes arranged in vertical rows on opposite sides of the ends of flattened branchlets, spherical heads of cream-coloured flowers and narrowly oblong, crusty to woody pods.

Contents

Description

Acacia disticha is a glabrous spreading shrub that grows to a height of up to about 1 m (3 ft 3 in) high and 2 m (6 ft 7 in) wide in sheltered situations. Its branchlets are roughened by raised leaf bases where phyllodes have fallen. The phyllodes are elliptic and arranged in vertical rows on opposite sides of the ends of flattened branchlets, variable in size, 15–43 mm (0.59–1.69 in) long and 4–22 mm (0.16–0.87 in) wide with a gland 2–5 mm (0.079–0.197 in) above the base of the phyllode. The flowers are arranged in two spherical heads in axils on peduncles 7–11 mm (0.28–0.43 in) long, each head with six or seven loosely arranged, cream-coloured flowers. Flowering occurs from September to February, and the pods are narrowly oblong, crusty to more or less woody, up to 40 mm (1.6 in) long and 5.0–5.5 mm (0.20–0.22 in) long on a strongly curved stalk. The seeds are oblong, about 4 mm (0.16 in) long and slightly shiny brown with an aril on the end. [2] [3] [4] [5] [6]

Taxonomy

Acacia disticha was first formally described in 1995 by Bruce Maslin in the journal Nuytsia , from specimens collected by Alex George on the northern end of Middle Mount Barren in 1970. [2] [7] The specific epithet (disticha) means 'in two rows or lines', referring to the arrangement of the phyllodes. [2]

Distribution and habitat

This species of wattle grows on sand, rocky loam and limestone soils amongst rocks and along watercourses in tall shrubland or closed scrub where it dominates he low scrub layer. It is an uncommon species, mostly confined to the Fitzgerald River National Park, but also in the Corackerup Nature Reserve 100 km (62 mi) to the west-south-west and the Ravensthorpe Range abpout 40 km (25 mi) to the north east, in the Esperance Plains bioregion of south-western Western Australia. [3] [6]

Conservation status

Acacia disticha is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions. [6]

See also

References

  1. 1 2 "Acacia disticha". Australian Plant Census. Retrieved 12 October 2025.
  2. 1 2 3 Maslin, Bruce R. (1995). "Acacia Miscellany 12. Acacia myrtifolia (Leguminosae: Mimosoideae: section Phyllodineae) and its allies in Western Australia". Nuytsia. 10 (1): 89–91. Retrieved 12 October 2025.
  3. 1 2 Maslin, Bruce R. Kodela, Phillip G. (ed.). "Acacia disticha". Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. Retrieved 12 October 2025.
  4. ↑ "Acacia disticha". Australian Biological Resources Study. Retrieved 12 October 2025.
  5. ↑ "Acacia disticha". World Wide Wattle. Retrieved 12 October 2025.
  6. 1 2 3 "Acacia disticha". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  7. ↑ "Acacia disticha". APNI. Retrieved 12 October 2025.
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