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Erigeron sionis : ウィキペディア英語版 | Erigeron sionis
''Erigeron sionis'' is a North American species of flowering plant in the daisy family known by the common name Zion fleabane.〔 It has been found in the southwestern United States, only in southern Utah. Some of the populations are inside Zion National Park, after which the species is named.〔(Biota of North America Program 2014 county distribution map )〕〔(Zion Plant List, United States Department of the Interior, National Park Service )〕 ''Erigeron sionis '' grows in shallow soil in open woodlands dominated by pine, juniper, Douglas fir, maple, and oak. It is a perennial, colony-forming herb up to 25 cm (10 inches) tall, spreading by means of stolons running along the surface of the ground. The inflorescence generally contains 1-4 flower heads. Each head contains 22–46 white ray florets surrounding many yellow disc florets.〔(Flora of North America, ''Erigeron sionis'' Cronquist, 1947. Zion fleabane )〕〔(Nesom, Guy L. 1976. A new species of ''Erigeron'' (Asteraceae) and its relatives in southwestern Utah. Brittonia 28: 263-272 ) as ''Erigeron proselyticus''〕 ;Varieties〔〔 *''Erigeron sionis'' var. ''sionis'' *''Erigeron sionis'' var. ''trilobatus'' (Maguire ex Cronquist) S.L.Welsh ==References==
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