| 词条 | Eucalyptus steedmanii |
| 释义 |
|name = Steedman's gum |genus = Eucalyptus |species = steedmanii |status=VU |status_system=EPBC |authority = C.A.Gardner |}}Eucalyptus steedmanii, commonly known as steedman's gum[1] or steedman's mallet,[2] is a tree that is native to Western Australia.[1] DescriptionThe erect tree typically grows to a height of {{convert|2|to|8|m|ft|0}} but may reach as high as {{convert|12|m|ft|0|abbr=on}}. It blooms between January and March producing white flowers.[1] The tree is a Marlock and has no lignotuber.[2] It has smooth bark that ranges from grey to red-brown to a bright coppery colour. It has numerous ascending branches from low on the trunk, forming a very dense crown. Adult leaves are olive-green and glossy in appearance, and are crowded with oil veins the leaves are up to about {{convert|8|cm|in|1}} in length with a width of {{convert|1.5|cm|in|2|abbr=on}}. Buds form that are yellowish-brown and the fruits are held on long stalks and have a square cross-section. Fruits grow to about {{convert|2.2|cm|in|2|abbr=on}} long with a diameter of {{convert|1.7|cm|in|2|abbr=on}}.[6] DistributionIt is found on low hills and undulating plains betweenRavensthorpe in the Goldfields-Esperance and Kondinin in the Wheatbelt region where it grows in gravelly loamy soils over ironstone.[1] Six populations are known, five of these occur on unallocated Crown land, and one which is split occurs on Crown land and a road verge. It is estimated that there is a total population of 24 500 mature plants that are spread over an area of {{convert|83.6|km2|sqmi|0}} and tend to occur in pure stands.[6] HistoryFirst formally described by the botanist C.A.Gardner in 1933 as part of the work Contribution to the Flora of Western Australia published in Joseph Maiden's Journal of the Royal Society of Western Australia.[3] The name of the plant honours Henry Steedman who was an avid plant collector. The species was listed as Vulnerable in 2008 under the Environment Protection and Biodiversity Conservation Act 1999. The main threat to the tree is fire which kills adult plants, but regeneration by seed has been observed. Other threats include mining operations, firebreak maintenance and recreation activities.[4] See also{{Portal|Trees}}
References1. ^1 2 3 {{FloraBase|name=Eucalyptus steedmanii|id=5777}} {{Taxonbar|from=Q15355733}}2. ^1 {{cite web|url=http://www.australiaplants.com/eucalyptus_steedmanii.htm|title=Eucalyptus steedmanii Steedman's Mallet|accessdate=19 April 2017|publisher=Windmill Outback Nursery|year=2011}} 3. ^{{cite web|url=http://bie.ala.org.au/species/http://id.biodiversity.org.au/node/apni/2887576#names|title=Eucalyptus steedmanii C.A.Gardner Steedman's Gum|accessdate=19 April 2017|work=Atlas of Living Australia|publisher=Global Biodiversity Information Facility}} 4. ^1 2 {{cite web|url=http://www.environment.gov.au/biodiversity/threatened/species/pubs/15393-conservation-advice.pdf|title=Approved Conservation Advice for Eucalyptus steedmanii (Steedmans Gum)|date=16 December 2008|accessdate=19 April 2017|publisher=Commonwealth of Australia}} 6 : Rosids of Western Australia|Trees of Australia|Eucalyptus|Myrtales of Australia|Plants described in 1934|Taxa named by Charles Gardner |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。