Banksia columnaris is a species of column-like shrub that is endemic to Western Australia. It has pinnatifid leaves with between five and eighteen lobes on each side, heads of pale yellow to purple flowers and usually only one or two follicles forming in each head.
| Banksia columnaris | |
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| Banksia columnaris at Dryandra Woodland, Western Australia | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Proteales |
| Family: | Proteaceae |
| Genus: | Banksia |
| Subgenus: | Banksia subg. Banksia |
| Series: | Banksia ser. Dryandra |
| Species: | B. columnaris
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| Binomial name | |
| Banksia columnaris | |
| Synonyms[1] | |
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Description
editBanksia columnaris is a shrub that typically grows to a height of 2 m (6 ft 7 in) but does not form a lignotuber. The leaves are linear in shape and pinnatifid, 50–150 mm (2.0–5.9 in) long and 3–15 mm (0.12–0.59 in) wide on a woolly, hairy petiole up to 40 mm (1.6 in) long. Each side of the leaves has between five and eighteen curved, triangular lobes up to 8 mm (0.31 in) long. The flowers are borne on a sessile head surrounded by leaves and with tapering hairy, linear involucral bracts up to 20 mm (0.79 in) long at the base of the head. There are between 25 and 35 flowers in each head, each flower with a curved, pale yellow to purple perianth 11–14 mm (0.43–0.55 in) long and a reddish brown pistil 13–20 mm (0.51–0.79 in) long. Flowering occurs from May to June and one or two broadly egg-shaped or wedge-shaped follicles 10–12 mm (0.39–0.47 in) long form in each head.[2][3][4]
Taxonomy and naming
editThis banksia was first formally described in 1996 by Alex George in the journal Nuytsia and given the name Dryandra columnaris from specimens he collected in 1969 in the Boyagin Nature Reserve near Brookton.[2][5] In 2007, Austin Mast and Kevin Thiele transferred all the dryandras to the genus Banksia and this species became Banksia columnaris.[6][7] The specific epithet (columnaris) is a Latin word meaning "column-like", referring to the habit of this species.[2]
Distribution and habitat
editBanksia columnaris grows in low woodland and kwongan in a few areas between Brookton and Narrogin in the Avon Wheatbelt and Jarrah Forest biogeographic regions.[2][4]
References
edit- ^ a b "Banksia columnaris". Australian Plant Census. Retrieved 14 April 2020.
- ^ a b c d George, Alex S. (1996). "New taxa and a new infrageneric classification in Dryandra R.Br". Nuytsia. 10 (3): 388–389.
- ^ George, Alex S. (1999). Flora of Australia (PDF). Vol. 17B. Canberra: Australian Biological Resources Study, Canberra. pp. 346–347. Retrieved 14 April 2020.
- ^ a b "Banksia columnaris". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- ^ "Dryandra columnaris". APNI. Retrieved 14 April 2020.
- ^ "Banksia columnaris". APNI. Retrieved 14 April 2020.
- ^ Mast, Austin R.; Thiele, Kevin (2013). "The transfer of Dryandra R.Br. to Banksia L.f. (Proteaceae)". Australian Systematic Botany. 20 (1): 63–71. doi:10.1071/SB06016.