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''Iris hexagona'' is a species in the genus ''Iris'', it is also in the subgenus of ''Limniris'' and in the ''Series hexagonae''. It is a rhizomatous perennial. It has the common name of Dixie Iris,〔(【引用サイトリンク】url=http://www.fs.fed.us/wildflowers/beauty/iris/louisiana/iris_hexagona.shtml )〕〔(【引用サイトリンク】url=http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?20327 )〕 (Dixie is a common name for the southeastern United States〔Daniel F. Austin 〕) and it also occasionally known as 'Carolina iris'.〔(【引用サイトリンク】url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101704 )〕〔(【引用サイトリンク】url=http://luirig.altervista.org/naturaitaliana/viewpics2.php?rcn=31549 )〕 In Florida, it was known as the 'Prairie iris',〔 but this due to a population of ''Iris hexagona var. savannarum'' which was later classified as a synonym of ''Iris savannarum''. Most of the ''I. hexagona'' population in Florida was ''Iris savannarum''. The name 'hexagona', refers to the six angled seed head.〔 The Louisiana Irises and the name of the series of Hexagonae are derived from ''Iris hexagona'', which was published (in Latin) and described by Walter in 'Flora Caroliniana' page 66 in April–June of 1788.〔(【引用サイトリンク】url=http://www.ipni.org/ipni/idPlantNameSearch.do?id=438698-1 )〕〔(【引用サイトリンク】url=http://www.biodiversitylibrary.org/page/10001134#page/73/mode/1up )〕 As most irises are diploid, having two sets of chromosomes. This can be used to identify hybrids and classification of groupings. It has a chromosome count: 2n=44 (Riley, 1942) 〔〔〔(【引用サイトリンク】url=http://facstaff.hsc.unt.edu/rbarton/Iris/hexas/I_hexagona.html )〕 and 2n=44 (Snoad 1952). ''Iris hexagona'' is a name accepted by the RHS.〔(【引用サイトリンク】url=http://apps.rhs.org.uk/horticulturaldatabase/hortdatabase.asp?ID=271759 )〕 It is listed as a native plant to be suitable use in landscaping in Georgia.〔Bonnie Harper-Lore, Maggie Wilson (editors)〕 The rhizomes (thickened roots) of ''Iris hexagona'' contain poison. If eaten, it could cause nausea, vomiting, abdominal pain, diarrhea and an elevated temperature. The roots, seeds and plant sap can also cause skin irritation if touched.〔(【引用サイトリンク】url=http://plants.ces.ncsu.edu/plants/all/iris-hexagona/ )〕 Research has also been carried out on the effects of saltwater on the ''Iris.'' Normally, saltwater getting into a wetland ecosystem can destroy or damage many native plant populations. ''Iris hexagona'' is a salt-sensitive species. The 2-year research found that saltwater affected the iris flowering times by several days, since ''Iris'' flowers are only receptive to pollinators for 2 days or less. This could have significant effects on iris colonies. It also means that the iris can be 'stressed' during episodic events (such as tropical storms). ==Cultivation== The Louisiana irises generally all have similar cultivation requirements. They need 6 hours of full sunlight per day,〔), moist, acidic soils (pH of 6.5) with a high organic and fertility content.〔〔Neil G. Odenwald and James R. Turner 〕 They have a high moisture requirement during the growing season to be able to flower prolifically.〔 The new leaves grow in the autumn and consequently suffer in winter (if heavily frosted). They can be used planted by the edges of ponds and pools or they can be planted in the water – but need the rhizomes pinned into the ground to stop them floating away.〔 If grown in borders, they need a mulch to retain moisture (in the soil) and to protect the rhizomes from sun burn.〔 Propagation is best carried out by division of the rhizomes.〔〔Nick Romanowski 〕 Which is best carried out in late summer, when the plants are dormant. The ground must be prepared before planting, with the addition of a generous amount of organic matter and the soils dug to about deep (to allow for new root growth). Plants require dividing every 3–4 years to promote good flowering. They can combine with other plants but tend to 'move' to suitable positions. If using a fertilizer, sprinkle around the plant in late January or February, before the plant is in flower.〔 The iris seed is not hard to raise, but does take many years to germinate and then they take 3–5 years before reaching flowering stage.〔 The seed should be sown before they dry out.〔 ''Iris brevicaulis'' and ''Iris hexagona'' are primarily pollinated by bumblebees. Propagation is best carried out by division of the rhizomes, which is best carried out in late summer or autumn when the plants are dormant.〔 The ground must be prepared before planting, with the addition of a generous amount of organic matter and the soils dug to about deep (to allow for new root growth). Plants require dividing every 3–4 years to promote good flowering. They can combine with other plants but tend to 'move' to suitable positions. If using a fertilizer (or feed), sprinkle in late January or February, before the plant is in flower.〔〔 ''Iris giganticaerulea'' and ''Iris hexagona'' are considered too tender for cultivation in the UK, although in Kew Gardens (in London) the plant is grown in a rock garden, near a stream. William Rickatson Dykes recommends a sheltered position.〔 It is thought to be hardy to -15 degrees Celsius in the UK.〔 In the US, they best grown in the southeastern states.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Iris hexagona」の詳細全文を読む スポンサード リンク
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