Banksia occidentalis

Species of shrub in the family Proteaceae endemic to the south coast of Western Australia

speciesbox
|name = Red swamp banksia
|image = Banksia occidentalis. jpg
|image caption = Banksia occidentalis in the ANBG
|genus = Banksia
|parent = Banksia subg. Banksia
|species = occidentalis
|authority = R. Br. |synonyms ref = ]]

Banksia occidentalis, commonly known as the red swamp banksia, is a species of shrub or small tree that is endemic to the south coast of Western Australia. It has smooth bark, linear, sparsely serrated leaves, golden flowers in a cylindrical spike, and later up to sixty follicles in each spike.

Banksia occidentalis is a shrub or small tree that typically grows to a height of and has smooth bark but does not form a lignotuber. The leaves are linear, sparsely serrated, whorled, long, wide on a petiole long. The flowers are arranged in a cylindrical spike long and wide at flowering. The flowers are gold coloured with red styles, the perianth long and the pistil long and hooked. Flowering occurs from April to May or from August to November or January and the follicles are elliptical, long, high and wide. Up to sixty follicles form in each spike, the old flowers having fallen.

Banksia occidentalis was first formally described in 1810 by Robert Brown in Transactions of the Linnean Society of London. The specific epithet (occidentalis) is a Latin word meaning "western", referring to the distribution of this species relative to the related B. spinulosa. George placed this species in section Oncostylis, series Spicigerae.

Red swamp banksia occurs along the south coast of Western Australia between Augusta and Cape Arid National Park where it grows in shrubland or woodland, usually on the edges of swamps but sometimes also on coastal dunes.

This banksia is listed as "not threatened" by the Western Australian Government Department of Parks and Wildlife. The species was observed to be in cultivation in England in the gardens of Chiswick House in 1834.