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''Iris vorobievii'' is a species in the genus ''Iris'', it is also in the subgenus of Iris and in the ''Psammiris'' section. It is a rhizomatous perennial, from Russia close to the Chinese border. It has long and thin green leaves, similar sized stem and pale yellow or bright yellow flowers with a pale yellow beard. It is cultivated as an ornamental plant in temperate regions. ==Description== It is a species similar in form to ''Iris humilis''. It has a short (about long), thick (about 1.3 cm) and ovoid (in shape) rhizome.〔〔(【引用サイトリンク】url=http://flower.onego.ru/other/iris/iris_hum.html )〕 The rhizome produces 2-3 buds or short branches, but after the plant has flowered, the main rhizome dies. So the plant does not like other rhizomatous irises form creeping plants.〔〔〔(【引用サイトリンク】url=http://flower-iris.ru/en/knigi-pro-iridariy/zaglyanut-v-knigu/66/ )〕 Under the rhizome are thick secondary roots,〔〔〔 that are slightly branched, long and 2mm wide.〔 On top of the rhizome, are the fibrous remains of last seasons leaves.〔〔 It has linear or ensiform (sword shaped), green, basal (growing from the base) leaves.〔〔〔 They can grow up to between long and 1.8–2 cm wide.〔〔〔 They are almost equal in length to the stem.〔 It has erect stems that can grow up to between long.〔 The stem holds 1 or 2 terminal (top of stem) flowers,〔 in May.〔〔 The flowers are in diameter,〔 and come in shades of yellow, from pale yellow,〔〔 to bright yellow.〔 It has 2 pairs of petals, 3 large sepals (outer petals), known as the 'falls' and 3 inner, smaller petals (or tepals), known as the 'standards'. The falls have dark brown veining,〔〔 and in the centre, a pale yellow beard.〔〔 After the iris has flowered, between June to July,〔〔 it produces a seed capsule, that is long and 1.7 cm wide.〔 It also has a 5mm long spout (or appendage).〔 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 vorobievii」の詳細全文を読む スポンサード リンク
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