Acacia yirrkallensis

Acacia yirrkallensis is a shrub of the genus Acacia and the subgenus Plurinerves. It is native to the top end of the Northern Territory.[1]

Acacia yirrkallensis
LC (TPWCA)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Clade: Mimosoideae
Genus: Acacia
Species:
A. yirrkallensis
Binomial name
Acacia yirrkallensis
Occurrence data from AVH
Synonyms[2]

Racosperma yirrkallense (Specht) Pedley

Description

A. yirrkallensis is a resinous shrub to growing from 1 m to 2 m high. It can be erect or be lying flat on the ground and it branches near the ground. The bark is smooth, and a dark grey to dark brown. The smooth, brown/dark red-brown/yellowish branchlets are angular and have ridges which have minute resin crenulations. The straight to slightly curved, leathery phyllodes are very narrowly elliptic, and 1.5-4.5 cm by 1.4-5.2 mm, and have prominent stomata, with 1 or more prominent veins and indistinct parallel minor veins. Its globular yellow heads are 3-4.5 mm in diameter, with 10-13 flowers per head. The flowers are 5-merous and have a smooth, almost free calyx which is 0.9-1.1 mm long. The smooth corolla is 1.4-1.6 mm long. The woody, straight-sided, flat pods are oblanceolate, narrowing toward the base and 2-5 cm by 4-9 mm, and have oblique striations. Both the margins and the seed-partitions are prominent. The brown to dark brown seeds are 2.5-3.5 mm long. The stalk of the ovule expands to give a top-shaped aril.[4]

It flowers from June to January,[4] and fruits from February to October.[1]

Habitat

It usually grows in eucalypt forest and woodland on grey sandy podsols, on laterite and bauxite on stony sandstone ridges and gorges.[4]

Distribution

It is found in the Bioregions of Arnhem Coast, Arnhem Plateau, Central Arnhem, Gulf Fall and Uplands, Pine Creek, and Tiwi Cobourg.[1]

See also

References
  1. "Acacia yirrkallensis NT Flora". eflora.nt.gov.au. Retrieved 26 January 2020.
  2. "Acacia yirrkallensis". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
  3. Specht, R.L. in Specht, R.L. & Mountford, C.P. (ed.) (1958) The Gymnospermae and Angiospermae collected on the Arnhem Land Expedition. Records of the American-Australian Scientific Expedition to Arnhem Land No. 3 Botany and Plant Ecology: 185, 232-233, fig. 4
  4. Tindale, M.D.; Kodela, P.G. (2020). "Acacia yirrkallensis Specht". Flora of Australia. Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 27 January 2020.
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