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.
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 namingedit
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]
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.
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]
Ecologyedit
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]
^ abGeorge, Alex S. (1999). Flora of Australia(PDF). Vol. 17B. Canberra: Australian Biological Resources Study, Canberra. pp. 344–346. Retrieved 22 April 2020.
^ abcGeorge, Alex S. (1996). "New taxa and a new infrageneric classification in Dryandra R.Br". Nuytsia. 10 (3): 387–388.
^"Dryandra conferta". APNI. Retrieved 22 April 2020.
^Bentham, George; von Mueller, Ferdinand (1870). Flora Australiensis (Volume 5). London: Lovell Reeve & Co/. p. 578. Retrieved 22 April 2020.
^Francis Aubie Sharr (2019). Western Australian Plant Names and their Meanings. Kardinya, Western Australia: Four Gables Press. p. 168. ISBN9780958034180.
^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". Australian Plant Census. Retrieved 22 April 2020.
^"Banksia densa var. parva". Australian Plant Census. Retrieved 22 April 2020.
^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" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 22 April 2020.
Cavanagh, Tony; Pieroni, Margaret (2006). The Dryandras. Melbourne: Australian Plants Society (SGAP Victoria); Perth: Wildflower Society of Western Australia. ISBN1-876473-54-1.
Wikisource has original text related to this article:
banksia, densa, species, column, like, shrub, that, endemic, western, australia, deeply, serrated, pinnatifid, leaves, creamy, yellow, flowers, heads, seventy, five, hairy, follicles, conservation, status, priority, poorly, known, taxa, scientific, classificat. 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 Banksia densa Conservation status Priority Two Poorly Known Taxa DEC Scientific classification 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 densaA R Mast amp K R Thiele 1 Synonyms 1 Dryandra conferta Benth Josephia conferta Benth Kuntze Contents 1 Description 2 Taxonomy and naming 3 Distribution and habitat 4 Ecology 5 Conservation status 6 ReferencesDescription editBanksia 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 editThis 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 Banksia densa var densa 10 Banksia densa var parva 11 Distribution and habitat editBanksia 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 editAn 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 editThis 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 edit a b Banksia densa Australian Plant Census Retrieved 22 April 2020 a b Banksia densa FloraBase Western Australian Government Department of Biodiversity Conservation and Attractions a b George Alex S 1999 Flora of Australia PDF Vol 17B Canberra Australian Biological Resources Study Canberra pp 344 346 Retrieved 22 April 2020 a b c George Alex S 1996 New taxa and a new infrageneric classification in Dryandra R Br Nuytsia 10 3 387 388 Dryandra conferta APNI Retrieved 22 April 2020 Bentham George von Mueller Ferdinand 1870 Flora Australiensis Volume 5 London Lovell Reeve amp Co p 578 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 Retrieved 22 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 Banksia densa var densa Australian Plant Census Retrieved 22 April 2020 Banksia densa var parva Australian Plant Census Retrieved 22 April 2020 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 PDF Government of Western Australia Department of Parks and Wildlife Retrieved 22 April 2020 Cavanagh Tony Pieroni Margaret 2006 The Dryandras Melbourne Australian Plants Society SGAP Victoria Perth Wildflower Society of Western Australia ISBN 1 876473 54 1 nbsp Wikisource has original text related to this article Flora Australiensis Volume V CIV Proteaceae 29 Dryandra Dryandra conferta Retrieved from https en wikipedia org w index php title Banksia densa amp oldid 1101583940, wikipedia, wiki, book, books, library,
