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''Ageratina luciae-brauniae'' is a species of flowering plant in the aster family known by the common names Lucy Braun's snakeroot and rockhouse white snakeroot. It is native to the eastern United States, where it is limited to the Cumberland Plateau of Kentucky and Tennessee.〔(''Ageratina luciae-brauniae''. ) The Nature Conservancy.〕〔(Biota of North America Program 2014 county distribution map )〕 It may also occur in South Carolina but these reports are unconfirmed.〔(''Ageratina luciae-brauniae''. ) Center for Plant Conservation.〕 This perennial herb grows 30 to 60 centimeters tall. It has oppositely arranged leaves with thin oval or somewhat triangular blades up to 8 centimeters long by 9 wide. The inflorescence is a cluster of flower heads containing white disc florets and no ray florets.〔(''Ageratina luciae-brauniae''. ) Flora of North America.〕 This plant grows in rockhouses, sandy spaces under overhangs of sandstone rock. It grows in moist places where water drips off the rock above.〔 There are about 40〔 to 50〔 occurrences of the plant. Some populations in Kentucky are large but many are composed of just a few plants.〔 The plant was initially described in 1940 by American botanist Dr. Emma Lucy Braun, using the name ''Eupatorium deltoides.''〔(Braun, Emma Lucy 1940. Rhodora 42(494): 50–51 ) description in Latin, commentary in English〕 This name turned out to have been used three times before,〔(The International Plant Names Index search for ''Eupatorium deltoideum'' )〕 so it needed to be replaced with a new name. Merritt Lyndon Fernald dubbed it ''Eupatorium luciae-brauniae'' after Dr. Braun(1889-1971).〔(Fernald, Merritt Lyndon 1942. Rhodora 44(528): 463 )〕 ==See also== *Emma Lucy Braun 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「Ageratina luciae-brauniae」の詳細全文を読む スポンサード リンク
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