Banksia violacea
Violet banksia | |
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Inflorescence of Banksia violacea | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Proteales |
Family: | Proteaceae |
Genus: | Banksia |
Species: | B. violacea
|
Binomial name | |
Banksia violacea |
Banksia violacea, commonly known as violet banksia, is a species of shrub or tree in the plant genus Banksia (family Proteaceae). It generally grows as a small shrub to 1.5 m (5 ft) high with fine narrow leaves, and is best known for its unusually coloured dark purple-violet inflorescences. The colour of the inflorescences, short leaves, and flattened follicles which are sticky when young, help identify this species from others in the field.[2] It is found in low shrubland in southern regions of Western Australia from Esperance in the east to Narrogin in the west, growing exclusively in sandy soils.
First described in 1927 by the West Australian botanist Charles Gardner, the species was at one stage considered a variety of B. sphaerocarpa. Although there are no recognised subspecies or varieties, both lignotuberous and nonlignotuberous forms exist for Banksia violacea. Wasps, ants and flies have been recorded visiting flower spikes. Banksia violacea is classified as Not Threatened under the Wildlife Conservation Act of Western Australia. Regarded as of little value to floriculture, it is rarely cultivated.
Description
Banksia violacea grows as a shrub up to 1.5 m (5 ft) tall, with narrow leaves 1–2 cm (0.4–0.8 in) long and about 0.15 cm (0.06 in) wide.
The bright green cotyledon leaves of the seedlings are oblong to linear in shape and measure 1.5 cm (0.6 in) long by 0.3 cm (0.1 in) wide. The greenish red hypocotyl is hairy, as are the stems of young plants. The hairy seedling leaves are crowded and oppositely arranged. They measure 0.7–1.3 cm (0.2–0.5 in) in length and have recurved margins. Young plants often begin branching within their first year of life.[2]
Taxonomy
The
In George's 1981 arrangement, B. violacea was placed in
In 1996,
B. violacea | |
This clade became the basis of B. subseries Longistyles, which Thiele defined as containing those taxa with very long and slender styles, smoothly convex perianth limbs without a costal ridge, and thickened margins. In accordance with their cladogram, their arrangement placed B. violacea first in taxonomic sequence, followed by B. laricina (Rose-fruited Banksia).[9] However, Thiele and Ladiges' arrangement was not accepted by George, who, questioning the emphasis on cladistics, rejected most of their changes in his 1999 arrangement, restored B. series Abietinae to his broader 1981 definition, and abandoned all of Thiele and Ladiges' subseries. George commented that the species has no close relatives, being "loosely allied" to B. sphaerocarpa (Fox Banksia) and B. telmatiaea (Swamp Fox Banksia). Despite this, the sequence of the series was altered so that B. violacea fell between B. scabrella (Burma Road Banksia) and B. incana, and its placement in George's arrangement may be summarised as follows:[4]
- Banksia
- B. subg. Banksia
- B. sect. Banksia (9 series, 50 species, 9 subspecies, 3 varieties)
- B. sect. Coccinea(1 species)
- B. sect. Oncostylis
- B. ser. Spicigerae (7 species, 2 subspecies, 4 varieties)
- B. ser. Tricuspidae(1 species)
- B. ser. Dryandroideae (1 species)
- B. ser. Abietinae
- B. sphaerocarpa (3 varieties)
- B. micrantha
- B. grossa
- B. telmatiaea
- B. leptophylla (2 varieties)
- B. lanata
- B. scabrella
- B. violacea
- B. incana
- B. laricina
- B. pulchella
- B. meisneri (2 subspecies)
- B. nutans (2 varieties)
- B. subg. Isostylis (3 species)
- B. subg. Banksia
Since 1998, an American botanist,
B. dolichostyla | |
B. violacea | |
Early in 2007, Mast and Thiele initiated a rearrangement of Banksia by merging
Distribution and habitat
B. violacea occurs in southern regions of Western Australia, from
Ecology
Like most other
Banksia violacea is one of a small number of Banksia species that has both
Banksia flowerheads in general play host to a variety of birds, mammals and insects.[19] However, only wasps, ants and flies were recorded visiting flower spikes during observations for The Banksia Atlas in the mid-1980s.[3]
Cultivation
Banksia violacea is rarely cultivated. It is a slow-growing plant that tends to become untidy with age, and generally does not flower until four to five years after sprouting from seed. Flowers are an unusual colour, but occur within the bush where they grow within and are usually obscured by foliage. It tolerates light
See also
- Data related to Banksia violacea at Wikispecies
References
- ^ "Banksia violacea". Australian Plant Name Index (APNI), IBIS database. Canberra, Australian Capital Territory: Centre for Plant Biodiversity Research, Australian Government. Retrieved 26 November 2012.
- ^ a b c d e f g h George, Alex S. (1981). "The Genus Banksia L.f. (Proteaceae)". Nuytsia. 3 (3): 239–473.
- ^ ISBN 0-644-07124-9.[page needed]
- ^ ISBN 0-643-06454-0.
- Journal and Proceedings of the Royal Society of Western Australia. 13: 61–68.
- ^ a b "Banksia violacea C.A.Gardner". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government. Retrieved June 26, 2010
- ISBN 0-85179-864-0.
- ISBN 1-875560-29-7.[page needed]
- ^ .
- ^ PMID 21665734.
- doi:10.1071/SB97026.
- doi:10.1071/SB04015.
- doi:10.1071/SB06016.
- ^ Department of Biodiversity, Conservation and Attractions. Retrieved June 26, 2010
- S2CID 32550881.
- ^ "Part 2, Appendix 4: The responses of native Australian plant species to Phytophthora cinnamomi" (PDF). Management of Phytophthora cinnamomi for Biodiversity Conservation in Australia. Department of the Environment and Heritage, Australian Government. 2006. Archived from the original (PDF) on 5 March 2011. Retrieved 22 April 2009.
- ^ ISBN 0-86417-006-8.[page needed]
- .
- Department of Biodiversity, Conservation and Attractions. Retrieved June 24, 2010.
- ^ Sedgley, Margaret (1998). "Banksia: New proteaceous cut flower crop" (PDF). Horticultural Reviews. 22: 1–25.
- ISBN 0-643-09298-6.