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Cirsium wrightii : ウィキペディア英語版 | Cirsium wrightii
''Cirsium wrightii'', Wright's marsh thistle, is an endangered species of North American plants in the sunflower family. It is a monocarpic perennial sometimes reaching as much as 300 cm (10 feet) in height. The species was originally collected in 1851 in Arizona by Charles Wright.〔(Gray, Asa 1853. Smithsonian Contributions to Knowledge 5(6): 101 )〕 ==Distribution== Wright's marsh thistle is known to be found at the present time in only 7 counties in South-Central New Mexico.〔(Biota of North America Program 2014 county distribution map )〕 It has also, however, known to have existed in the past in Sonora, Chihuahua, Texas and Arizona.〔 There are many hypothesis over what caused the shrinkage of the species, of which one is drought. Since these are wetland plants, a decrease in water has detrimental effects on their survival.〔
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「Cirsium wrightii」の詳細全文を読む
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