Biology:Banksia densa
| Banksia densa | |
|---|---|
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. densa
|
| Binomial name | |
| Banksia densa A.R.Mast & K.R.Thiele[1]
| |
| Synonyms[1] | |
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Banksia densa is a species of column-like shrub that is endemic to Western Australia. It has deeply serrated to pinnatifid leaves, creamy yellow flowers in heads of up to seventy-five, and hairy follicles.
Description
Banksia densa is a shrub, usually with a column-like form that typically grows to a height of 2.5 m (8 ft 2 in) but does not form a lignotuber. It has linear, pinnatifid leaves that are 50–150 mm (2.0–5.9 in) long and 8–15 mm (0.31–0.59 in) wide on a petiole up to 10 mm (0.39 in) long. There are between eight and thirteen sharply pointed linear to triangular lobes up to 9 mm (0.35 in) long on each side of the leaves and the lower surface is covered with woolly white hairs. The flowers are arranged in heads of between forty and seventy-five with rusty-hairy or velvety, linear involucral bracts up to 15 mm (0.59 in) long at the base of the head. The flowers have a creamy yellow, hairy perianth 15–18 mm (0.59–0.71 in) or 21–25 mm (0.83–0.98 in) long, depending on subspecies, and a mostly glabrous pistil 16–26 mm (0.63–1.02 in) long or 25–30 mm (0.98–1.18 in) long. Flowering occurs from May to October and the fruit is a hairy, egg-shaped to elliptical follicle 9–13 mm (0.35–0.51 in) long.[2][3][4]
Taxonomy and naming
This species was first formally described in 1870 by George Bentham who gave it the name Dryandra conferta and published the description in Flora Australiensis.[5][6] The specific epithet (conferta) is from a Latin word meaning "crowded".[7]
In 1996, Alex George described two varieties:[4]
- Dryandra conferta var. conferta with a perianth 21–25 mm (0.83–0.98 in) long and a pistil 25–30 mm (0.98–1.18 in) long and flowers with a mouse-like or honey-like scent;
- Dryandra conferta var. parva with a perianth 15–18 mm (0.59–0.71 in) long and a pistil 16–26 mm (0.63–1.02 in) long.
In 2007, Austin Mast and Kevin Thiele transferred all Dryandra species to Banksia. As there was already a species named Banksia conferta, Mast and Thiele changed the specific epithet to "densa".[8][9]
The changed names of the varieties are as follows and are accepted at the Australian Plant Census:
Distribution and habitat
Banksia densa is widespread in inland parts of the south-west of Western Australia, growing in kwongan, woodland and shrubland between Miling, Cadoux the Porongorups, Bodallin and Mount Holland. Variety parva has a more southerly distribution than var. densa.[4][3]
Ecology
An assessment of the potential impact of climate change on this species found that its range is likely to contract by between 50% and 80% by 2080, depending on the severity of the change.[12]
Conservation status
This banksia is classified as "Priority Two" by the Western Australian Government Department of Parks and Wildlife[2] meaning that it is poorly known and from only one or a few locations.[13]
References
- ↑ 1.0 1.1 "Banksia densa". https://biodiversity.org.au/nsl/services/apc-format/display/204905.
- ↑ 2.0 2.1 "Banksia densa". FloraBase. Western Australian Government Department of Parks and Wildlife. https://florabase.dpaw.wa.gov.au/browse/profile/32561.
- ↑ 3.0 3.1 George, Alex S. (1999). Flora of Australia. 17B. Canberra: Australian Biological Resources Study, Canberra. pp. 344–346. https://www.environment.gov.au/system/files/pages/6d8c5c3b-8545-437e-b9b3-944ac95ee07a/files/flora-australia-17b-proteaceae-3-hakea-dryandra.pdf. Retrieved 22 April 2020.
- ↑ 4.0 4.1 4.2 George, Alex S. (1996). "New taxa and a new infrageneric classification in Dryandra R.Br.". Nuytsia 10 (3): 387–388.
- ↑ "Dryandra conferta". APNI. https://id.biodiversity.org.au/instance/apni/527154.
- ↑ Bentham, George; von Mueller, Ferdinand (1870). Flora Australiensis (Volume 5). London: Lovell Reeve & Co/. p. 578. https://www.biodiversitylibrary.org/item/42576#page/586/mode/1up. Retrieved 22 April 2020.
- ↑ Francis Aubie Sharr (2019). Western Australian Plant Names and their Meanings. Kardinya, Western Australia: Four Gables Press. p. 168. ISBN 9780958034180.
- ↑ "Banksia densa". APNI. https://id.biodiversity.org.au/instance/apni/614002.
- ↑ 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.
- ↑ "Banksia densa var. densa". https://biodiversity.org.au/nsl/services/apc-format/display/210262.
- ↑ "Banksia densa var. parva". https://biodiversity.org.au/nsl/services/apc-format/display/205107.
- ↑ Fitzpatrick, Matthew C.; Gove, Aaron D.; Sanders, Nathan J.; Dunn, Robert R. (2008). "Climate change, plant migration, and range collapse in a global biodiversity hotspot: the Banksia (Proteaceae) of Western Australia". Global Change Biology 14 (6): 1–16. doi:10.1111/j.1365-2486.2008.01559.x.
- ↑ "Conservation codes for Western Australian Flora and Fauna". Government of Western Australia Department of Parks and Wildlife. https://www.dpaw.wa.gov.au/images/documents/plants-animals/threatened-species/Listings/Conservation%20code%20definitions.pdf.
- Cavanagh, Tony; Pieroni, Margaret (2006). The Dryandras. Melbourne: Australian Plants Society (SGAP Victoria); Perth: Wildflower Society of Western Australia. ISBN 1-876473-54-1.
Wikidata ☰ Q4856590 entry
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