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Artemisia biennis
''Artemisia biennis'' is a species of sagebrush known by the common name biennial wormwood.'' It is a common and widely distributed weed, so well established in many places that its region of origin is difficult to ascertain. One source (Flora of North America) maintains that the species is most likely native to northwestern North America and naturalized in Europe, New Zealand, and eastern and southern North America.〔(Flora of North America Vol. 19, 20 and 21 Page 523 Biennial wormwood, armoise bisannuelle Artemisia biennis Willdenow, Phytographia. 11. 1794. )〕〔(Biota of North America Program 2014 county distribution map )〕
==Description==
This is an annual or biennial herb producing a single erect green to reddish stem up to in maximum height. It is generally hairless and unscented. The frilly leaves are up to long and divided into thin, lance-shaped segments with long teeth. The inflorescence is a dense rod of clusters of flower heads interspersed with leaves. The fruit is a tiny achene less than a millimeter wide.〔
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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