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Eurybia radula
''Eurybia radula'', commonly known as the low rough aster or rough wood aster, is an herbaceous perennial in the aster family. It is native to eastern North America where it is present from Newfoundland and Labrador in the far northeast of Canada, west to Ontario and south to Kentucky and Virginia in the United States. The low rough aster is also present on the French overseas territory of St. Pierre and Miquelon just south of Newfoundland. It typically grows in wet soils in a wide variety of habitats from bogs and fens to creek shores to ditches. Although it is not considered threatened over most of its distribution, it is imperiled or possibly extirpated over much of its range in the United States. Its flower heads emerge in the late summer to early fall and show pale blue-violet rays with yellow centres.
==Taxonomy==
One formerly recognised variety, namely ''Aster radula'' var. ''strictus'' (Pursh) A. Gray, is present in the northern part of its range including Newfoundland and Labrador, northern Quebec and northern Nova Scotia. It differs in being more slender and having only 1 to 8 heads, which is probably a response to the harsh climate. However, it is not commonly recognised due to the range of intermediates that exist from north to south and currently no combination (i.e. with var. ''strictus'') currently exists in ''Eurybia''.〔
The common name rough aster probably stems from a misreading of the Latin specific name ''radula'', which actually means scraper. The word for rough is ''radulans'', which is quite similar.
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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