| 词条 | Melaleuca dempta |
| 释义 |
|image = Melaleuca dempta (leaves, flowers, fruits).JPG |image_caption = M. dempta leaves, flowers and fruit |status = P3 |status_system = DECF |genus = Melaleuca |species = dempta |authority = Craven |synonyms_ref = [1] |synonyms =
}} Melaleuca dempta is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It is an erect shrub resembling Melaleuca calycina with its heads of white flowers and egg-shaped to heart-shaped leaves. It was formerly considered a subspecies of Melaleuca calycina subsp. dempta but it lacks the star-like fruits of that species and its leaves have a blunt rather than a pointed tip. DescriptionMelaleuca dempta is a shrub often growing to about {{convert|2.2|m|ft|sigfig=1|abbr=on}} high with the branches glabrous except when very young. Its leaves are arranged in alternating pairs at right angles to the leaves above and below so that the leaves are in four rows along the stems. The leaves are {{convert|4.2-8|mm|in|sigfig=1|abbr=on}} long, {{convert|2.5-6.2|mm|in|sigfig=1|abbr=on}} wide, broadly elliptic, egg-shaped or heart-shaped with the end tapering to a rounded point.[1][2]The flowers are white and arranged in heads on the ends of branches which continue to grow after flowering. The heads are up to {{convert|18|mm|in|sigfig=1|abbr=on}} in diameter with up to 4 individual flowers. The petals are {{convert|2.6-2.9|mm|in|sigfig=2|abbr=on}} long and fall off as the flower ages. There are five bundles of stamens around the flower, each with 22 to 29 stamens. Flowering occurs mainly in September but may continue to February and is followed by fruit which are woody capsules {{convert|4.6-6.2|mm|in|sigfig=2|abbr=on}} long with five blunt teeth persisting around the edge. (These teeth are long in Melaleuca calycina giving its fruit a star shape when viewed end-on.)[1][2] Taxonomy and namingThis species was first formally described in 1988 as Melaleuca calycina subsp. dempta Barlow by B.A.Barow and K.J. Cowley.[3] It was raised to species status in 1999 by Lyndley Craven.[4][5] The specific epithet (dempta) is a Latin word meaning "removed" or "taken away"[6] referring to the lack of long, curved teeth around the fruit.[1] Distribution and habitatMelaleuca dempta occurs in and between the Scaddan, Gibson and Dalyup River districts[1][2] in the Esperance Plains and Mallee biogeographic regions.[7] It grows in dense scrub in sandy soil in swampy areas and on the edges of clay pans.[1][2]ConservationMelaleuca dempta is listed as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[7] meaning that it is known from only a few locations but is not currently in imminent danger.[8]References1. ^1 2 3 4 5 {{cite book|last1=Brophy|first1=Joseph J.|last2=Craven|first2=Lyndley A.|last3=Doran|first3=John C.|title=Melaleucas : their botany, essential oils and uses|date=2013|publisher=Australian Centre for International Agricultural Research|location=Canberra|isbn=9781922137517|page=143}} {{Taxonbar|from=Q6811010}}2. ^1 2 3 {{cite book|last1=Holliday|first1=Ivan|title=Melaleucas : a field and garden guide|date=2004|publisher=Reed New Holland Publishers|location=Frenchs Forest, N.S.W.|isbn=1876334983|page=44|edition=2nd}} 3. ^{{cite web|title=Melaleuca calycina subsp. dempta|url=https://biodiversity.org.au/boa/instance/apni/509373|publisher=APNI|accessdate=2 September 2015}} 4. ^{{cite web|title=Melaleuca dempta|url=https://biodiversity.org.au/boa/instance/apni/561686|publisher=APNI|accessdate=3 May 2015}} 5. ^{{cite journal|last1=Craven|first1=L. A.|last2=Lepschi|first2=B. J.|title=Enumeration of the species and infraspecific taxa of Melaleuca (Myrtaceae) occurring in Australia and Tasmania|journal=Australian Systematic Botany|date=1999|volume=12|issue=6|page=872|doi=10.1071/SB98019}} 6. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page=258}} 7. ^1 {{FloraBase|name = Melaleuca dempta’'|id = 15693}} 8. ^{{cite web|title=Conservation codes for 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=1 May 2015}} 4 : Melaleuca|Flora of Western Australia|Plants described in 1988|Endemic flora of Western Australia |
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