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Grindelia squarrosa
''Grindelia squarrosa'', also known as a curly-top gumweed or curlycup gumweed, is a small North American biennial or short-lived perennial plant.〔(ITIS Standard Report Page: ''Grindelia squarrosa'' )〕
It is native to western and central North America, from British Columbia east to Québec and New England, and south as far as California, Arizona, Chihuahua, and Texas. The species may possibly be naturalized in much of the eastern part of that distribution.〔(United States Department of Agriculture plants profile: ''Grindelia squarrosa'' )〕〔(Biota of North America Program 2014 county distribution map )〕〔( Jepson Manual, University of California (TJM2) )〕〔( Lady Bird Johnson Wildflower Center Native Plant Information Network—NPIN, University of Texas: ''Grindelia squarrosa'' (Curlycup gumweed) )〕
==Description==
''Grindelia squarrosa'' is often found in disturbed roadsides, streamsides; in elevation. It is a decumbent to erect, much-branched perennial herb of subshrub up to 100 cm (40 inches) tall. The 1.5–7 cm leaves are gray-green, crenate with each tooth having a yellow bump near its tip, and resinous.〔〔
''Grindelia squarrosa''produces numerous flower heads in open, branching arrays. Each head usually contains 12-40 yellow ray flowers, though sometimes the rays are absent. These surround many small disc flowers. The plant blooms from July through late September.〔〔(Kansas Wildflowers & Grasses )〕〔(Flora of North America, ''Grindelia squarrosa'' (Pursh) Dunal, 1819. )〕
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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