| 词条 | Eucalyptus arcana |
| 释义 |
| name = Mallee manna gum | image = Eucalyptus arcana.jpg | image_caption = | status_system = | status = | genus = Eucalyptus | species = arcana | authority = (Nicolle & Brooker) K.Rule[1] | synonyms_ref =[1] | synonyms = Eucalyptus splendens subsp. arcana Nicolle & Brooker }} Eucalyptus arcana, commonly known as the Mallee manna gum or Carpenter Rocks gum[2] is a mallee that is endemic to South Australia. It has rough bark from the base of the trunk to the thinnest branches, lance-shaped, sometimes curved leaves, flower buds in groups of seven, white flowers and hemispherical fruit. It is only known from a single population near Carpenter Rocks. DescriptionEucalyptus arcana is a low, straggly tree, sometimes with several stems, that typically grows to {{convert|6|m|ft|0}} high. It has rough, fibrous, grey to grey-brown bark from the base of the trunk to the larger branches, and smooth, grey to cream bark on the thinnest branches. Young plants and coppice regrowth have four-sided stems and glossy elliptic to egg-shaped leaves {{convert|45-120|mm|in|1}} long and {{convert|13-55|mm|in|1|abbr=on}} wide with wavy edges. Adult leaves are lance-shaped, the same glossy green on both sides, with a blade that is {{convert|80-150|mm|in|1}} long and {{convert|17-30|mm|in|1|abbr=on}} wide on a petiole {{convert|10-28|mm|in|1|abbr=on}} long. The flowers buds are arranged in groups of seven on a peduncle {{convert|4-10|mm|in|1|abbr=on}} long, the individual flowers on a pedicel up to {{convert|2|mm|in|1|abbr=on}} long. Mature buds are oval to spindle-shaped, {{convert|5-7.5|mm|in|2|abbr=on}} long and {{convert|4-5.5|mm|in|2|abbr=on}} wide with an operculum that is shaped like a blunt cone, about equal in length to the floral cup. Flowering occurs in February and the flowers are white. The fruit are hemispherical to cone-shaped, {{convert|6-7|mm|in|2|abbr=on}} long and {{convert|6-8|mm|in|2|abbr=on}} wide containing dark brown to black ovoid seeds.[3][4][5][6]Taxonomy and namingMallee manna gum was first formally described in 1998 by Dean Nicolle and Ian Brooker who gave it the name Eucalyptus splendens subsp. arcana and published the description in the Journal of the Adelaide Botanic Gardens.[7][8] In 2009 Kevin Rule raised it to species status as E. arcana.[9][10] The specific epithet (arcana) is a Latin word meaning "shut up", "secret", private" or "mysterious",[11] referring to the species being hidden in dense scrub.[8] Distribution and habitatEucalyptus arcana has a limited range and occurs on low rises in shallow, impoverished, red clay-loam soils over limestone around the coastal town of Carpenter Rocks in south-east South Australia. It is found amongst dense tall shrubland, associated with species including Eucalyptus obliqua and Eucalyptus ovata. The populations that Nicolle and Brooker described as E. splendens subsp. arcana occurring near Moonlight Head in south-west Victoria have been assessed as a form of E. aromaphloia.[3][10]See also
References1. ^1 {{cite web|title=Eucalyptus arcana|url=https://biodiversity.org.au/nsl/services/apc-format/display/159059 |publisher=Australian Plant Census|accessdate=3 March 2019}} {{Taxonbar|from=Q28813538}}2. ^{{cite web|url=http://www.dn.com.au/Eucalypts_of_South_Australia_Common_Names_List.html|title=Native Eucalypts of South Australia|author=Dean Nicolle|accessdate=21 October 2016}} 3. ^1 {{cite web|url=https://spapps.environment.sa.gov.au/SeedsOfSA/speciesinformation.html?rid=1875|title=Eucalyptus arcana (Myrtaceae) Carpenter Rocks Gum|accessdate=3 March 2019|work=Seed of South Australia|publisher=Botanic Gardens of South Australia}} 4. ^{{cite web |title=Eucalyptus splendens subsp. arcana |url=http://keyserver.lucidcentral.org:8080/euclid/data/02050e02-0108-490e-8900-0e0601070d00/media/Html/Eucalyptus_splendens_subsp._arcana.htm |publisher=Euclid: Centre for Australian National Biodiversity Research |accessdate=3 March 2019}} 5. ^{{cite web |last1=Nicolle |first1=Dean |last2=Kellerman |first2=Jürgen (ed.) |title=Flora of South Australia |url=https://data.environment.sa.gov.au/Content/Publications/FSA_Myrtaceae_01.pdf |publisher=State Herbarium of South Australia |accessdate=3 March 2019}} 6. ^{{cite book |last1=Nicolle |first1=Dean |title=Native Eucalypts of South Australia |date=2013 |publisher=Dean Nicolle |location=Adelaide |isbn=9780646904108 |pages=152–153}} 7. ^{{cite web|title=Eucalyptus splendens subsp. arcana|url=https://id.biodiversity.org.au/instance/apni/570736|publisher=APNI|accessdate=3 March 2019}} 8. ^1 {{cite journal |last1=Nicolle |first1=Dean |last2=Brooker |first2=Ian |title=Eucalyptus splendens subsp. arcana (Myrtaceae) an endangered new subspecies endemic to South Australia |journal=Journal of the Adelaide Botanic Gardens |date=1998 |volume=18 |issue=2 |pages=103–106 |url=https://data.environment.sa.gov.au/Content/Publications/JABG18P103_Nicolle.pdf |accessdate=3 March 2019}} 9. ^{{cite web|title=Eucalyptus splendens arcana |url=https://id.biodiversity.org.au/instance/apni/650386 |publisher=APNI|accessdate=3 March 2019}} 10. ^1 {{cite journal |last1=Rule |first1=Kevin |title=Eucalyptus arcana (Myrtaceae), a new combination for a former subspecies of Eucalyptus splendens and notes on a population of scentbark occurring near Moonlight Head in south-west Victoria |journal=Muelleria |date=2009 |volume=27 |issue=2 |pages=230–232 |url=https://www.rbg.vic.gov.au/documents/Muelleria_27%282%29%2C_p230-232%2C_Rule%2C_Eucalyptus_arcana.pdf |accessdate=3 March 2019}} 11. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page =691}} 6 : Trees of Australia|Eucalyptus|Myrtales of Australia|Flora of South Australia|Flora of Victoria (Australia)|Plants described in 2009 |
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