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Lactuca canadensis : ウィキペディア英語版 | Lactuca canadensis
''Lactuca canadensis'' is a species of wild lettuce known by the common names Canada lettuce, Canada wild lettuce, tall lettuce,〔(''Lactuca canadensis''. ) Germplasm Resources Information Network (GRIN).〕 and Florida blue lettuce.〔(''Lactuca canadensis''. ) ITIS.〕 Its true native range is not clear,〔 but it is considered to be a native of the eastern and central parts of North America. It naturalized in the western part of the continent as well as in Eurasia.〔(''Lactuca canadensis''. ) The Jepson eFlora 2013.〕〔(Biota of North America Program 2014 county distribution map )〕 ''Lactuca canadensis'' is a generally biennial herb in the daisy family growing from a taproot to maximum heights of 50–200 cm (20-80 inches) or more. The leaves are deeply lobed and occasionally toothed. The top of the stem bears an inflorescence with many flower heads, each up to 1 cm (0.4 inches wide when open. The heads have many pale yellow ray florets but no disc florets. The fruit is a dark-colored achene about half a centimeter (0.2 inches) long with a white pappus.〔(Flora of North America, ''Lactuca canadensis'' )〕 ==References==
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