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Encelia
''Encelia'' is a genus of the plant family Asteraceae. It consists of shrubs (and one geophyte) of arid environments in southwestern North America and western South America.〔(Flora of North America, ''Encelia'' Adanson, Fam. Pl. 2: 128. 1763. )〕
All have n = 18 chromosomes. All the North American species are obligate outcrossers. In cultivation, the species readily form fertile F1 hybrids, F2s, and backcrosses, but in natural areas of sympatry, F2s and backcrosses are absent or rare.
''Encelia'' species are used as plants plants by the larvae of some Lepidoptera species including the leaf miner ''Bucculatrix enceliae'' which feeds exclusively on ''Encelia farinosa''.
The phylogenetic sister group of ''Encelia'' is a clade comprising the genera ''Enceliopsis'' and ''Geraea''. The three genera are informally called the "Encelia alliance".〔(Encelia and its relatives )〕
''Encelia'' is named in honor of German biologist Christophorus Enzelius, 1517–1583.〔
;Species〔〔(Biota of North America Program 2013 county distribution maps )〕
*''Encelia asperifolia'' (S.F.Blake) C. Clark & Kyhos - Baja California
*''Encelia californica'' Nutt. - Baja California, Baja California Sur, California
*''Encelia canescens'' Lam. - Peru, northern Chile, Bolivia
*''Encelia conspersa'' Benth. - Baja California Sur
*''Encelia densifolia'' C.Clark & Kyhos - Baja California Sur
*''Encelia farinosa'' Torr. & A.Gray var. ''farinosa'' - Brittlebush - Baja California, Baja California Sur, California, Sonora, Sinaloa, Hidalgo, Arizona, Utah, Nevada
*''Encelia frutescens'' (A.Gray) A.Gray - Arizona, California, Nevada, Baja California
*''Encelia halimifolia'' Cav. - Baja California, Baja California Sur, Sonora
* ''Encelia hispida'' Andersson - Galápagos
*''Encelia laciniata'' Vasey & Rose - Baja California, Baja California Sur
*''Encelia nutans'' Eastwood - Utah, Colorado
*''Encelia palmeri'' Vasey & Rose - Baja California Sur
* ''Encelia pilocarpa'' Rubsy- Bolivia
* ''Encelia pilosiflora'' S.F.Blake - Peru
*''Encelia ravenii'' Wiggins - Baja California Sur
*''Encelia resinifera'' C. Clark - Utah, Arizona
* ''Encelia scaposa'' (A.Gray) A.Gray- Chihuahua, Texas, New Mexico
* ''Encelia stenophylla'' Greene - Baja California, Baja California Sur
*''Encelia ventorum'' T.S Brandegee - Baja California, Baja California Sur
*''Encelia virginensis'' A. Nels. - California, Arizona, Utah, Nevada, New Mexico
== 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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