| 词条 | Calothamnus accedens |
| 释义 |
|status = P4 |status_system = DECF |genus = Calothamnus |species = accedens |authority = Hawkeswood |synonyms =Melaleuca accedens (Hawkeswood) Craven & R.D.Edwards }}Calothamnus accedens, commonly known as Piawaning clawflower is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It was first formally described in 1984, declared extinct in 1992, rediscovered in 2004, removed from the "extinct" list in 2013 and found to have a population of at least 25,000 in 2015. It is a small erect shrub with crowded hairy leaves and red flowers. In 2014 Craven, Edwards and Cowley proposed that the species be renamed Melaleuca accedens.[1] DescriptionCalothamnus accedens grows to a height of about {{convert|1.8|m|ft|sigfig=1}} and has a single trunk, sometimes with papery bark, but is densely branched. Its leaves are crowded at the ends of the branches, stiff and needle-like, mostly {{convert|10-15|mm|in|sigfig=1}} long and {{convert|0.8-1.0|mm|in|sigfig=1}} wide. They are covered with long, whitish hairs at first but become glabrous with age and have distinct oil glands.[2][3]The flowers are a shade of dark pink to crimson and arranged in clusters of 4 to 10, mostly on one side of the stem. The petals are {{convert|6.5-8|mm|in|sigfig=1}} long with a prominent vein in the centre. The stamens are arranged in claw-like bundles with 15 to 21 stamens per bundle. Flowering occurs in February and is followed by fruits which are woody, cup-shaped or cylindrical capsules, {{convert|5-6|mm|in|sigfig=2}} long and {{convert|6.2-9|mm|in|sigfig=1}} in diameter.[2][3] Taxonomy and namingCalothamnus accedens was first formally described in 1984 by Trevor Hawkeswood from a specimen found on a roadside between Piawaning and Wongan Hills.[2][4] The population in that area was apparently destroyed during roadwork in the 1980s and the species declared extinct in 1992.[3][5] In 2004 a specimen was collected in a botanical survey, then other populations were located so that by 2007, the population size was estimated at more than 25,000 and the species was removed from the endangered list.[3] The specific epithet (accedens) is a Latin word meaning "approaching"[6] referring to the similarity of this species to Calothamnus brevifolius and Calothamnus hirsutus).[2]Distribution and habitatCalothamnus accedens occurs in the area between Perth and {{convert|420|km|mi|sigfig=1}} to the north of Perth[3] in the Avon Wheatbelt, Geraldton Sandplains, Jarrah Forest and Swan Coastal Plain biogeographic regions.[7] It grows in sandy soils over laterite.[2]ConservationThis species was removed from the extinct list on 6 March 2013 and is recommended for removal from all lists under the Australian Government Environment Protection and Biodiversity Conservation Act 1999. Although some populations are in areas outside protected zones, it is estimated that at least 20,000 individual plants are in a national park.[3] It is classified as "Priority Four" by the Western Australian government Department of Parks and Wildlife[7] meaning that is rare or near threatened.[8] References1. ^{{cite journal|last1=Craven|first1=Lyn A.|last2=Edwards|first2=Robert D.|last3=Cowley|first3=Kirsten J.|title=New combinations and names in Melaleuca (Myrtaceae)|journal=Taxon|date=30 June 2014|volume=63|issue=3|pages=663–670|doi=10.12705/633.38|url=http://www.ingentaconnect.com/content/iapt/tax/2014/00000063/00000003/art00017|accessdate=23 July 2015}} {{Taxonbar|from=Q15395734}}2. ^1 2 3 4 {{cite journal|last1=Hawkeswood|first1=Trevor J.|title=Calothamnus accedens T.J.Hawkeswood (Myrtaceae), a rare and endangered new species from Western Australia|journal=Nuytsia|date=1984|volume=5|issue=2|pages=305–310}} 3. ^1 2 3 4 5 {{cite web|title=Advice to the Minister for Sustainability, Environment, Water, Population & Communities from the Threatened Species Scientific Committee|url=http://www.environment.gov.au/biodiversity/threatened/species/pubs/19500-listing-advice.pdf|publisher=Australian Government Department of the Environment|accessdate=6 June 2015}} 4. ^{{cite web|title=Calothamnus accedens|url=https://biodiversity.org.au/boa/instance/apni/526875|publisher=APNI|accessdate=6 June 2015}} 5. ^{{cite web|title=Endangered Species Protection Act 1992|url=http://www.comlaw.gov.au/Details/C2004A04485|publisher=Australian Government ComLaw|accessdate=6 June 2015}} 6. ^{{cite web|title=accedens|url=https://en.wiktionary.org/wiki/accedens|publisher=Wiktionary|accessdate=6 June 2015}} 7. ^1 {{FloraBase|name = Calothamnus accedens’'|id = 5396}} 8. ^{{cite web|title=Conservation codes for Western Australian Flora and Fauna|url=http://www.dpaw.wa.gov.au/images/documents/plants-animals/threatened-species/Listings/conservation_code_definitions.pdf|publisher=Government of Western Australia Department of Parks and Wildlife|accessdate=25 July 2015}} 5 : Calothamnus|Myrtales of Australia|Flora of Western Australia|Plants described in 1984|Endemic flora of Western Australia |
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