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・ Erigeron radicatus
・ Erigeron reductus
・ Erigeron religiosus
・ Erigeron rhizomatus
・ Erigeron robustior
・ Erigeron rybius
・ Erigeron rydbergii
・ Erigeron salishii
・ Erigeron salmonensis
・ Erigeron sanctarum
・ Erigeron saxatilis
・ Erigeron sceptrifer
・ Erigeron schmalhausenii
・ Erigeron scopulinus
・ Erigeron seravschanicus
Erigeron serpentinus
・ Erigeron sionis
・ Erigeron sivinskii
・ Erigeron socorrensis
・ Erigeron sparsifolius
・ Erigeron speciosus
・ Erigeron strigosus
・ Erigeron subglaber
・ Erigeron subtrinervis
・ Erigeron supplex
・ Erigeron taipeiensis
・ Erigeron tenellus
・ Erigeron tener
・ Erigeron tenuis
・ Erigeron tianschanicus


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Erigeron serpentinus : ウィキペディア英語版
Erigeron serpentinus

''Erigeron serpentinus'' is a rare species of flowering plant in the daisy family known by the common names serpentine fleabane and serpentine daisy. It is endemic to Sonoma County, California, where it is known from three occurrences in and around The Cedars, in the Coast Ranges east of Salt Point and west of Healdsburg.〔(California Native Plant Society Rare Plant Profile )〕〔(Calflora taxon report, University of California, ''Erigeron serpentinus'' G. Nesom serpentine daisy, serpentine erigeron )〕〔(Nesom, Guy L. 1992. Phytologia 72(3): map 1, page 164 ) distribution map showing ''Erigeron serpentinus'' and several other species〕 There are an estimated 1100 individuals in existence.〔(The Nature Conservancy )〕 The Cedars is a canyon habitat with serpentine soils surrounded by non-serpentine terrain; it is home to several rare serpentine-endemic plant species.〔Raiche, R. (2009). (The Cedars: Sonoma County's Hidden Treasure. ) ''Fremontia'' 37:2 3.〕 This daisy was discovered there and described to science in 1992.〔Nesom, G. L. (1992). Revision of ''Erigeron'' sect. ''Linearifolii'' (Asteraceae: Astereae). ''Phytologia'' 72 157–208.〕
''Erigeron serpentinus'' is a perennial herb producing an upright stem up to 50 centimeters (20 inches)long from a taproot and caudex unit. The linear leaves are up to 4 centimeters (1.6 inches) long and under a millimeter wide. The inflorescence is a solitary flower head or a cluster of 2-4 heads. Each has 9–13 white ray florets 7 or 8 millimeters in length which turn blue as they dry. These surround numerous yellow disc florets.〔(Flora of North America, ''Erigeron serpentinus'' G. L. Nesom, 1992. Serpentine fleabane )〕〔(Nesom, Guy L. 1992. Phytologia 72(3): 203–204 ) diagnosis in Latin, description and commentary in English〕
==References==


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