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''Heterotheca oregona'' is a species of flowering plant in the daisy family known by the common name Oregon false goldenaster. It is native to the west coast of Canada and the United States in British Columbia, Washington, Oregon, and California as far south as Los Angeles County.〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Heterotheca oregona'' (Nutt.) Shinn., Oregon false goldenaster, Oregon golden aster )〕〔(Turner Photographics, ''Heterotheca villosa'' - Wildflowers of the Pacific Northwest ) photos, description, partial distribution map〕 ''Heterotheca oregona'' is found in low-elevation mountain forests and chaparral, often near water. This is a perennial herb which is variable in appearance, with four somewhat indistinct varieties. It reaches a maximum height of 20 centimeters (8 inches) to one meter (40 inches) , and is covered in small bristles. The inflorescence contains 1-15 flower heads in a flat-topped array. Each head has 14-60 yellowish disc florets but no ray florets. The fruit is an achene with a long grayish pappus.〔(Flora of North America, ''Heterotheca oregona'' (Nuttall) Shinners, 1951. Oregon goldenaster )〕 ;Varieties〔〔〔 *''Heterotheca oregona'' var. ''compacta'' (D.D.Keck) Semple from Monterey County to Siskiyou County *''Heterotheca oregona'' var. ''oregona'' - Washington, Oregon, California as far south as Monterey County *''Heterotheca oregona'' var. ''rudis'' (Greene) Semple - Oregon, California as far south as San Benito County and Amador County *''Heterotheca oregona'' var. ''scaberrima'' (A.Gray) Semple from Glenn County to San Luis Obispo County ==References== 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「Heterotheca oregona」の詳細全文を読む スポンサード リンク
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