Acacia littorea

The dense pungent shrub typically grows to a height of 0.5 to 3.0 metres (1.6 to 9.8 ft) and produces yellow flowers from August to November.[4] It has glabrous but prominently ribbed branchlets. The green, pungent and somewhat crowded phyllodes are ascending on the branchlets. They have an interesting obtriangular to obdeltate shape resembling a sharks tooth. The phyllodes are 7 to 17 millimetres (0.28 to 0.67 in) long and 5 to 15 mm (0.20 to 0.59 in) and sometimes larger. The simple inflorescences have globular heads containing 8 to 15 pale-yellow flowers. After flowering blackish to yellowish linear to curved seed pods that are around 6 centimetres (2.4 in) in length with a width of 2.5 to 3 mm (0.10 to 0.12 in). The pods contain shiny brown oblong seeds arranged longitudinally which are 2.5 to 3 mm (0.10 to 0.12 in) long.[5]

The species was first formally described by the botanist Bruce Maslin in 1978 as part of the work Studies in the genus Acacia (Mimosaceae) – 8 A revision of the Uninerves – Triangulares, in part (the tetramerous species) published in the journal Nuytsia.[6]

The type specimen was collected by Bruce Maslin along the shoreline of Princess Royal Harbour near Albany in 1975.[5]

Several synonyms exist: Acacia dolabriformis, Acacia trapezoides, Acacia cuneata var. glabra, Acacia decipiens var. triangularis, Mimosa decipiens and Acacia praemorsa.[6]

The species is closely related to Acacia truncata.[5]

It is native to an area in the South West, Great Southern and Peel regions of Western Australia.[4] The bulk of the population is found from Busselton east to Bremer Bay. An isolated population is found on Rottnest Island.[5] A. littorea grows mostly on coastal dunes in deep sandy soils and in limestone area.[4] It is commonly found in heath land communities and can be a dominant species.[5]

A. littorea is commercially available in seed form[7] or as tubestock.[8] It prefers a sunny position and well-drained soils and suits a coastal garden. The species is drought- and frost-tolerant. It is fast-growing but short-lived and suitable for erosion control or as a windbreak.[1]

• List of Acacia species