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Ambrosia tomentosa
''Ambrosia tomentosa'', the skeletonleaf bur ragweed,〔(Easern Colorado Wildflowers, ''Ambrosia tomentosa'' (Skeletonleaf Burr Ragweed or Skeletonleaf Bursage) )〕 silverleaf povertyweed, or skeleton-leaf bursage,〔(Center for Invasive Species and Ecosystem Health, skeletonleaf bursage ''Ambrosia tomentosa'' Nutt. )〕〔(Oregon State University, StreamWebs, Skeletonleaf bursage ''(Ambrosia tomentosa)'' )〕〔(Germplasm Resources Information Network ) Retrieved 2010-03-25.〕 is a North American species of perennial plants in the (aster family).〔
Skeletonleaf bur ragweed is native to the west-central part of the United States, primarily the western Great Plains, the Colorado Plateau, and eastern Great Basin. 〔(United States Department of Agriculture plants profile ) accessed 2.14.2013〕〔(Biota of North America Program 2014 county distribution map )〕
It is considered a noxious weed in several states.〔〔(University of Wyoming, Department of Ecosystem Science & Management, Skeletonleaf Bursage, ''Ambrosia tomentosa'' )〕〔(Washington State Noxious Weed Control Board, skeleton-leaf bursage, ''Ambrosia tomentosa'' )〕
==Description==
''Ambrosia tomentos'' grows up to 3 feet (91 cm) tall. The deeply lobed hairy leaves grow to 5 inches (12.7 cm) and have toothed margins. Flowers are small and yellow and produce spined 2-seeded burrs. In addition to seeds it can also reproduce via its widely spreading roots.〔(Idaho's Noxious Weeds – Skeletonleaf Bursage ) Retrieved 2010-03-25.〕〔(Flora of North America Vol. 21 Page 17 ''Ambrosia tomentosa'' Nuttall, Gen. N. Amer. Pl. 2: 186. 1818. )〕
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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