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''Isocoma acradenia'' is a North American species of flowering plant in the daisy family known by the common name alkali goldenbush. It is native to the Southwestern United States (California, Nevada, Utah, Arizona) and northwestern Mexico (Sonora, Baja California). It grows in arid, sandy areas, particularly mineral-rich areas such as alkali flats and gypsum soils.〔C.Michael Hogan, ed. 2010. (''Isocoma acradenia''. Encyclopedia of Life )〕〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Isocoma acradenia'' (E. Greene) E. Greene, Desert isocoma, alkali goldenbush )〕〔(SEINet, Southwestern Biodiversity, Arizona chapter )〕〔(Nesom, G.L. 1991. Taxonomy of ''Isocoma'' (Compositae: Astereae). Phytologia 70(2): 69–114 ) includes distribution map on page 72〕 ==Description== ''Isocoma acradenia'' is a bushy subshrub reaching maximum heights of slightly over a meter (40 inches). It produces erect, branching stems which are a shiny pale yellowish white, aging to a yellow-gray.〔(Flora of North America, ''Isocoma acradenia'' (Greene) Greene, Erythea. 2: 111. 1894. Alkali jimmyweed )〕 Along the tough, hard-surfaced stems are linear or oval-shaped glandular leaves long, sometimes with stumpy teeth along the edges. They are gray-green and age to pale gray or tan. 〔 The inflorescences along the top parts of the stem branches are clusters of four or five flower heads.〔(Jepson Manual Treatment, University of California, (TJM93) of ''Isocoma acradenia'' )〕 Each head is a capsule encased in bumpy, glandular greenish phyllaries bearing many golden yellow disc florets at its mouth. Each disc floret is somewhat cylindrical and protruding. 〔 The fruit is an achene a few millimeters long, with a yellowish pappus adding another few millimeters.〔 ;Varieties〔〔〔〔 *''Isocoma acradenia'' var. ''acradenia'' - Salt scrub, often with creosote - Arizona, California, Nevada, Sonora *''Isocoma acradenia'' var. ''bracteosa'' (Greene) G. L. Nesom - salt flats - southern Central Valley in California *''Isocoma acradenia'' var. ''eremophila'' (Greene) G. L. Nesom - sandy soils, dunes, etc. - Arizona, California, Nevada, Utah, Baja California, Sonora). 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「Isocoma acradenia」の詳細全文を読む スポンサード リンク
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