| 词条 | Hakea aenigma |
| 释义 |
|name = Enigma hakea |image = |genus = Hakea |species = aenigma |authority = W.R.Barker & Haegi.[1] |range_map = Hakea aenigmaDistMap4.png |range_map_caption = Occurrence data from Australasian Virtual Herbarium }}Hakea aenigma, commonly known as the aenigma hakea,[2] is a shrub in the Proteaceae family native to South Australia. Only one of two Hakea species totally reliant on suckering to reproduce therefore have "reached evolutionary dead-ends".[3] DescriptionHakea aenigma is a rounded bushy shrub {{convert|1.5|to|2.5|m|ft|1}} high. Smaller branches are densely covered with flattened fine hairs, thinning nearer flowering time. The glabrescent leaves are flat and linear {{convert|5|to|35|cm|in|0}} long and {{convert|3|to|10|mm|in|1}} wide with prominent longitudinal veins 1-7 above and 4-9 on the underside. Each inflorescence has 16-33 flowers growing on an individual stalk. Pedicels and perianth are cream-white and smooth. The style {{convert|4.5-7.2|mm|in|sigfig=1|abbr=on}} long. Flowers are sterile so no fruit is produced and plants can only reproduce vegetatively by suckering roots. Hakea pulvinifera is the only other species reliant on this method for reproduction. Hakea aenigma has cream-white blooms throughout spring from September to November.[4]TaxonomyHakea aenigma was first formally described by the botanists Laurence Arnold Haegi and William Robert Barker in 1985 and published in the Journal of the Adelaide Botanic Gardens.[5][6]The specific epithet is taken from the Latin word aenigma meaning "riddle", "something obscure" or "inexplicable"[7]{{rp|302}} referring to the puzzlement of finding no fruit for the plant and the uncertainty of its origins.[4] DistributionThis species is endemic to a small area on the western end of Kangaroo Island in South Australia confined to the more elevated parts of the lateritic and is part of the dense mallee-heath that grows in clay-loam to sandy soils.[4] References1. ^{{cite web |last1=Barker |first1=William R. |last2=Haegi |first2=Laurence |title=Hakea aenigma |url=https://biodiversity.org.au/nsl/services/search?product=APC&tree.id=51209179&name=Hakea+aenigma&inc._scientific=&inc.scientific=on&inc._cultivar=&max=100&display=apc&search=true |website=Vascular Plants:APC |publisher=Australian Government |accessdate=1 February 2019}} {{Taxonbar|from=Q18081956}}2. ^{{cite web|url=http://bie.ala.org.au/species/Hakea+aenigma|title=Hakea aenigma W.R.Barker & Haegi - Enigma Hakea|accessdate=11 June 2016|work=Atlas of Living Australia|publisher=Global Biodiversity Information Facility}} 3. ^{{cite book |last1=Wilson (ed) |first1=Annette |last2=Barker |first2=Robyn M. |last3=Haegi |first3=Laurence A. |last4=Barker |first4=William R. |title=Flora of Australia:Volume 3 Hakea to Dryandra|date=1999 |publisher=Australian Department of Environment & Heritage |isbn=0-643-06454-0}} 4. ^1 2 {{cite web|url=http://www.flora.sa.gov.au/efsa/lucid/Hakea/key/Australian%20Hakea%20species/Media/Html/Hakea_aenigma.htm|title= Factsheet - Hakea aenigma |accessdate=11 June 2016|publisher=Government of South Australia}} 5. ^{{cite web|url=https://bie.ala.org.au/species/http://id.biodiversity.org.au/node/apni/2918745#names|title= Hakea aenigma W.R.Barker & Haegi|accessdate=17 October 2018|work=Atlas of Living Australia|publisher=Global Biodiversity Information Facility}} 6. ^{{cite web|author1=Barker, W.R.|author2=Haegi, L.|year= 1985|title=Taxonomy of the South Australian species allied to Hakea ulicina R.Br. (Proteaceae). Journal of the Adelaide Botanic Gardens 7(3): 261, fig. 7|url=https://data.environment.sa.gov.au/Content/Publications/JABG07P249_Haegi.pdf}} 7. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.}} 3 : Hakea|Flora of South Australia|Plants described in 1985 |
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