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Coreopsideae : ウィキペディア英語版 | Coreopsideae
Coreopsideae is a tribe of flowering plants belonging to the Asteroideae subfamily.〔(Asteroideae - Taxonomy )〕 == Classification == This tribe includes genera like ''Cosmos'' and ''Dahlia''.〔(Pyrrolizidine alkaloids from Neurolaena lobata )〕 A similar group has been recognized since 1829, generally as part of the tribe Heliantheae (Cassini, 1819). In the late 20th century, molecular studies caused a slightly redefined version of this group to be recognized as its own tribe, Coreopsideae.〔 The larger version of Heliantheae was split into tribes including Bahieae, Chaenactideae, Coreopsideae, Helenieae and, finally, Heliantheae (''sensu stricto'').〔Klaus Kubitzki, Joachim W. Kadereit, Charles Jeffrey; ''The Families and Genera of Vascular Plants''〕 The tribe is characterized by shiny green bracts at the base of the flower head in two rows: an inner row of tightly spaced bracts and an outer row of a smaller number pointing downward.
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