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Cyclachaena xanthiifolia
Giant sumpweed, ''Cyclachaena xanthiifolia'', is a North American plant species in the sunflower family. It is believed to be native to the Great Plains but now found across much of southern Canada and the contiguous United States, though rarely in the Southeast.〔(Biota of North America Program 2014 county distribution map )〕〔
Giant sumpweed is an annual herb roughly 1–3 meters (40-120 inches or 1¼-4 feet) tall with stout, erect, branched stems. The stems are erect or ascending, finely ridged or grooved, and grayish-green. They are usually unbranched but sometimes have straight, upright branches. They are hairless near the base and are sparsely to moderately covered with fine curved or curled hairs above the base.
==Habitat and ecology==
''Cyclachaena xanthiifolia'' grows in moist areas or previously disturbed sites. It can also be found in fields or along roadsides and streams.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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