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Centromadia pungens
''Centromadia pungens'' (common tarweed) is a species of North American plants in the tarweed tribe within the sunflower family. It is native to northern Baja California and the western United States (California, Oregon, Washington, Idaho, Nevada, Arizona). The plant is considered a noxious weed in parts of the Pacific Northwest.〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Centromadia pungens'' (Hook. & Arn.) Greene, common tarweed )〕
''Centromadia pungens'' is an herb up to 120 cm (48 inches) tall. It produces arrays of numerous yellow flower heads with both ray florets and disc florets. 〔(Flora of North America, Spikeweed, ''Centromadia'' Greene )〕〔(Greene, Edward Lee 1894. Manual of the Botany of the Region of San Francisco Bay 196 )〕〔(Torrey, John & Gray, Asa 1843. Flora of North America 2(3): 399 )〕
;Subspecies〔
* ''Centromadia pungens'' subsp. ''laevis'' (D.D.Keck) B.G.Baldwin - Baja California, southern California
* ''Centromadia pungens'' subsp. ''pungens'' - most of species range
==References==
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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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