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Ambrosia linearis : ウィキペディア英語版
Ambrosia linearis

''Ambrosia linearis'' is a species of flowering plant in the aster family known by the common names streaked bur ragweed, Colorado bursage, linear-leaf bursage, and plains ragweed. It is endemic to east-central part of the State of Colorado in the United States, where it occurs in Elbert, Pueblo, El Paso, Cheyenne, Crowley, Kiowa and Lincoln Counties.〔(''Ambrosia linearis''. ) The Nature Conservancy.〕〔(Biota of North America Program 2014 county distribution map )〕
This species is a perennial herb or subshrub growing up to 40 centimeters or more in height. The leaves are mostly linear. Some are divided into lobes which are linear. They vary in length, measuring up to a few centimeters long. Like some other ''Ambrosia'', the male and female flower heads are clustered separately on the inflorescence. The female head has a single floret while the male head contains several. The fruits are contained within a spiny bur.〔(''Ambrosia linearis''. ) Flora of North America.〕 The plant can reproduce vegetatively as well as sexually.〔
There are many populations of this plant, but several are basically "roadside occurrences that occupy ditches."〔(''Ambrosia linearis''. ) Center for Plant Conservation.〕 It commonly occurs along roadsides; in fact, "most of the eastern half of El Paso County is one vast roadside occurrence of this species".〔 Otherwise, the plant grows in playa lakes and other seasonally wet habitat types. This bursage is adapted to the disturbance created by the seasonal cycle in this part of the shortgrass prairie vegetation. Fewer populations occur in this good quality habitat than on roadsides and in ditches.〔
This species is threatened by the development of land for housing and agriculture, which consumes terrain with playa lakes and other appropriate native habitat.〔
==References==


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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