|
}} ''Iris virginica'', with the common name Virginia iris, is a perennial species of flowering plant, native to eastern North America. It is common along the coastal plain from Florida to Georgia in the Southeastern United States. 〔(USDA: ''Iris virginica'' )〕 It is one of the three ''Iris'' species in the ''Iris'' flower data set outlined by Ronald Fisher in his 1936 paper "The use of multiple measurements in taxonomic problems" as an example of linear discriminant analysis. == Description == ''Iris virginica'' is a perennial plant. The plant has 2 to 4 erect or arching, bright green, lance-shaped leaves that are flattened into one plane at the base. Leaves are 1–3 cm wide and are sometimes longer than the flower stalk. The fleshy roots (1–2 cm in diameter) are rhizomes that spread underground. Pale brown, variably shaped seeds are born in three-part fruit capsules (3–6 cm long, 1–2 cm wide). 〔(Missouri Botanical Garden: ''Iris virginica'' )〕 The slightly fragrant flowers (4 cm long, 7 cm across) consist of 3 horizontal sepals, or "falls", and 3 erect petals. The petals and sepals can vary in color from dark-violet to pinkish-white. The sepals have a splash of yellow to yellow-orange at the crest. Each plant has 2 to 6 flowers that bloom from April to May upon a single, erect, 30-90 cm tall stalk. The stalk is sometimes branched and has a slight zigzag appearance. 〔 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 virginica」の詳細全文を読む スポンサード リンク
|