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}} ''Iris tridentata'' is a species in the genus ''Iris'', it is also in the subgenus of ''Limniris'' and in the 'Iris series Tripetalae''. It is a rhizomatous perennial. It has the common name of ''Savannah Iris''〔(【引用サイトリンク】 url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101720 )〕〔(【引用サイトリンク】url=http://www.fs.fed.us/wildflowers/beauty/iris/Blue_Flag/iris_tridentata.shtml )〕〔(【引用サイトリンク】url=http://florida.plantatlas.usf.edu/Plant.aspx?id=3113 )〕〔(【引用サイトリンク】url=http://www.flmnh.ufl.edu/herbarium/cat/catindices.asp?genus=Iris&FamSys=A )〕〔(【引用サイトリンク】url=http://explorer.natureserve.org/servlet/NatureServe?searchCommunityUid=ELEMENT_GLOBAL.2.732800 )〕〔(【引用サイトリンク】url=http://plants.usda.gov/core/profile?symbol=IRTR )〕〔Tina M. Samuels 〕 or ''Bay Blue-flag Iris''〔〔(【引用サイトリンク】url=http://www.namethatplant.net/plantdetail.shtml?plant=1965 )〕 Note, normally ''Iris versicolor'' is commonly called 'Blue flag iris'.〔 and occasionally ''Purple Flag''.〔Mary A. Hood 〕〔(【引用サイトリンク】url=http://wildflowers.jdcc.edu/Iridaceae.html )〕 Note, ''Iris germanica'' can also be called 'Purple Flag'. It was originally called ''Iris tripetala'' by Thomas Walter in Flor. Cab. 66. in 1788. But the specific name tripetala had to be later rejected because it had already been used by Carl Linnaeus the Younger (son of Carl Linnaeus), for what later became ''Moraea tripetala'' (L.f.) Ker Gawler.〔(【引用サイトリンク】url=http://wiki.irises.org/bin/view/Spec/SpecTridentata )〕 'Tridentata' means three toothed iris in Latin.〔(【引用サイトリンク】url=http://facstaff.hsc.unt.edu/rbarton/Iris/tripets/I_trident.html )〕〔Robert Sweet and Edwin Dalton Smith〕 It was first published by Pursh in 'Flora Americae Septentrionalis' (translated as Systematic Arrangement and Description of the Plants of North America) on December 1813.〔(【引用サイトリンク】 url=http://www.ipni.org/ipni/idPlantNameSearch.do?id=439203-1 )〕 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=40.〔 It is mentioned in 'A Fifth Checklist of Tennessee Vascular Plants'. Specimens are found in Florida Museum of Natural History.〔 It is hardy to USDA Zone 5 to 8.〔〔 It can grow in part-shaded places,〔 with acidic soils within gardens. It will grow well, when planted in a butterfly garden.〔 It can also be classed as a bog garden plant, tolerating waterside edges.〔 During the winter period, depending on the severity of the winter, the leaves generally die, to re-grow next spring. When, new plants are planted, they take a year to settle in before flowering.〔 They can be grown in large pots or containers.〔 It is rare in cultivation in the UK, as it is not very hardy. ==Description== Iris tridentata is unique among other irises, the flowers and growth habit is dissimilar to any other iris,〔 including the other two species within ''Iris series Tripetalae''.〔 The iris rhizome has been noted by W. R. Dykes (1913) as “almost stoloniferous,” by J. K. Small (1933), “the cord-like rootstocks are peculiar,” and by R. K. Godfrey and J. W. Wooton (1979), “clothed with coarse, strongly many-ribbed, brown, overlapping scales”.〔 The slender rhizomes,〔 branch very easily creating large spreading colonies.〔〔(【引用サイトリンク】url=http://www.orchideenkultur.net/index.php?topic=28569.30 )〕 They are generally 1.5–2 cm in diameter with coarse, strongly ribbed, brown, scale-like leaves.〔 It roots at the nodes of the rhizomes.〔〔 Iris grows to a height of between 30–70 cm tall,〔〔〔〔〔 (12" to 28").〔 The flowering stalk (stem) is generally taller than the surrounding leaves,〔 and 3–7 cm in diameter.〔 It has between 1 and 3 branches (normally one) holding one flower.〔〔〔 In late spring, the new bright green leaves will grow and lengthen,〔〔〔〔 from the base of the plant〔〔 and grow to between 30–50 cm long.〔〔 (a foot to 18in).〔 They occasionally have red-brown edge,〔〔 upright (or sword-like) in shape, and 1.5 to 2.3 cm wide.〔〔〔 The leaves can encircle the stem of the plant.〔 It has fragrant flowers in spring,〔〔 between May and June.〔〔〔 It comes in a range of blue shades. From violet,〔〔〔 violet-blue,〔〔〔〔 purple,〔 purple-blue〔〔 and blue.〔 They also have a darker purple veining and a yellow-white signal.〔〔〔〔 Very similar to ''Iris virginica'',〔 it has very small bristle free, standards (about 1.5 cm long).〔〔〔 The sepals are about 7–8 cm long (3inches).〔〔 The perianth tube is about 2–2.5 cm long.〔 It has a seed capsule (after flowering) between August and October.〔〔 The capsule is globule to oblong shaped, (about 2.5–4 × 2 cm).〔〔 Inside are dark red-brown semi-circular, flattened seeds (about 6-8mm wide).〔〔 The seeds are very similar to Louisiana irises or ''Iris virginica''.〔 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 tridentata」の詳細全文を読む スポンサード リンク
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