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Erigeron bonariensis
''Erigeron bonariensis'' is a species of ''Erigeron'', found throughout the tropics and subtropics as a pioneer plant; its precise native origin is unknown, but most likely Central America or South America. It has become naturalized in many other regions.〔(Flora of China, ''Erigeron bonariensis'' L. 1753. 香丝草 xiang si cao )〕〔(Comprehensive profile for ''Conyza bonariensis'' ), Malta Wild Plants〕〔( ''Conyza bonariensis'' ), Flowers in Israel〕〔(Altervista Flora Italiana, Cespica di Buenos Aires, ''Erigeron bonariensis'' L. ) includes photos and European distribution map〕 Common names include Flax-leaf Fleabane, Wavy-leaf Fleabane and Argentine Fleabane.〔(''Conyza bonariensis'' ), Germplasm Resources Information Network〕
''Erigeron bonariensis'' is a rare alien in south eastern England, found beneath walls and in cracks in pavements and concrete driveways. It flowers in August and continues fruiting until the first frosts (sometimes as late as Christmas Day in Berkshire). It is instantly recognisable by its blue-green foliage, very narrow, undulate leaves, and purple-tipped involucral bracts.
''Erigeron bonariensis'' grows up to in height and its leaves are covered with stiff hairs, including long hairs near the apex of the bracts. Its flower heads have white ray florets and yellow disc florets. It can easily be confused with ''Conyza canadensis'', which grows taller, and ''C. albida''.〔(''Conyza bonariensi'' ), International Environmental Weed Foundation〕
==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「Erigeron bonariensis」の詳細全文を読む
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