| 词条 | Eucalyptus youngiana |
| 释义 |
|name = Large-fruited mallee |image= Eucalyptus youngiana KP gnangarra-12.jpg |genus = Eucalyptus |species = youngiana | status_system = | status = |authority = F.Muell. }} Eucalyptus youngiana, commonly known as large-fruited mallee, Ooldea mallee and yarldarlba,[1] is a tree that occurs in arid and semi-arid areas of southern Western Australia and South Australia. DescriptionE. youngiana grows as a mallee with a typical height of {{convert|4|to|7|m|ft|0}}. It has rough, flaky bark that is a dark grey-brown bark on lower stems and smooth, pinkish-grey to creamy in colour above[2] and produces inflorescences with red or yellow flowers from June to October.[3] the bark is persistent on the trunks and lower parts of the main branches. The adult leaves have a broadly lanceolate shape and are up to {{convert|150|mm|in|1}} long[4] with a width of {{convert|40|mm|in|2}} and a dull, blue-green appearance.[2] The axillary flowers appear in groups of three[2] and can be up to {{convert|75|mm|in|2}} in diameter. The flower buds are up to {{convert|65|mm|in|2}} in length with a width of up to {{convert|40|mm|in|2|abbr=on}} with a cap that is horn-shaped.[2] The fruit, or gumnuts, that follow are large and conspicuously ribbed[4] that have a length of around {{convert|45|mm|in|2|abbr=on}} and a width of about {{convert|70|mm|in|2|abbr=on}}. They are coarsely ribbed with a broad disc that is concave and ascending, with four to six rim-level valves. The fruit contains irregular pyramid-shaped brown coloured seeds that are to {{convert|4.5|mm|in|3|abbr=on}} long and {{convert|2.5|mm|in|3|abbr=on}} wide.[2]TaxonomyThe species was first published in 1876 by Ferdinand von Mueller,[4] based on specimens collected at Queen Victoria Spring by Jess Young during the Giles expedition of May 1875.[5] The specific name honours Jess Young, a member of the Giles fourth expedition[6] who collected the type specimen.[2] There are no subspecies or varieties. In 1969 Clifford Boomsma demoted it to a subspecies of E. pyriformis, but this was overturned by Ian Brooker in 2000.[4] Distribution and habitatIt has a fairly wide distribution, occurring throughout arid and semi-arid areas of Western Australia and South Australia. It is commonly found in the Great Victoria Desert ecosystem. The relief is generally gentle slopes. It grows in red sands and sandy loams.[3] References1. ^{{cite web | title = Australian Plant Common Names Database | url = http://www.anbg.gov.au/common.names/ | accessdate = 12 April 2007}} {{Taxonbar|from=Q5405732}}2. ^1 2 3 4 5 {{cite web|url=http://saseedbank.com.au/species_information.php?rid=1884|title=Eucalyptus youngiana (Myrtaceae) Yarldarlba, Large-fruited Mallee|work=Seeds of South Australia|accessdate=30 January 2018|publisher=Government of South Australia}} 3. ^1 {{FloraBase | name = Eucalyptus youngiana | id = 5803}} 4. ^1 {{APNI | name = Eucalyptus youngiana F.Muell. | id = 38545}} 5. ^{{cite book | first = Norman | last = Hall | year = 1978 | title = Botanists of the Eucalypts | location = Australia | publisher = Commonwealth Scientific and Industrial Research Organisation | isbn=0643002715}} 6. ^1 2 {{cite web|url=http://anpsa.org.au/e-young.html|title=Eucalyptus youngiana|accessdate=30 January 2018|publisher=Australian Native Plants Society}} 7 : Flora of South Australia|Plants described in 1876|Rosids of Western Australia|Myrtales of Australia|Eucalyptus|Mallees (habit)|Taxa named by Ferdinand von Mueller |
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