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Diarrhena americana
''Diarrhena americana'', also known as American beak grass or American beakgrain, is a native, perennial grass of North America,〔(【引用サイトリンク】url=http://web4.msue.msu.edu/mnfi/abstracts/botany/Diarrhena_obovata.pdf )〕 where it grows in rich, moist woodlands from Missouri to Maryland and south to Oklahoma and Alabama.〔(【引用サイトリンク】url=http://herbarium.usu.edu/webmanual/info2.asp?name=Diarrhena_americana&type=treatment )〕 It is considered to be threatened in Michigan, and is listed as endangered in Maryland and Wisconsin.〔(【引用サイトリンク】url=http://plants.usda.gov/java/profile?symbol=DIAM )〕 Culms range from 60–131 cm in height. Historically, ''Diarrhena americana'' was the only species of beak grass recognized in the United States; however studies have suggested that the known beak grass is to be classified into two distinct species, ''Diarrhena americana'' and ''Diarrhena obovata''.〔(【引用サイトリンク】url=http://temperate.lternet.edu/collins/sites/temperate.lternet.edu.collins/files/publications/Brandenberg_etal_1991_BTBC_0.pdf )〕
==Distribution==
''Diarrhena americana'' naturally occurs throughout the mid-east part of the United States. It ranges from Oklahoma to the east coast, and can even be seen as far north as Michigan.〔(【引用サイトリンク】url=http://plants.usda.gov/core/profile?symbol=DIAM )〕 Even though there is a rather large range in the United States, ''Diarrhena americana'' is now considered a distinct species with a more northern range, where much of the population is seen in southern Illinois.〔(【引用サイトリンク】url=http://www.illinoiswildflowers.info/grasses/plants/beak_grass.html )〕
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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