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Helianthus x laetiflorus : ウィキペディア英語版 | Helianthus × laetiflorus
''Helianthus × laetiflorus'' (cheerful sunflower) is a plant in the daisy family, Asteraceae. It is widespread in scattered locations across much of Canada from Newfoundland to British Columbia, and the central and eastern United States as far south as Texas and Georgia.〔(Biota of north America Program 2014 state-level distribution map )〕 ==Description== ''Helianthus × laetiflorus'' is a herbaceous plant with alternate, simple leaves, on green stems. The flowers are yellow, borne in late summer.〔Scoggan, H. J. 1979. Dicotyledoneae (Loasaceae to Compositae). Part 4. 1117–1711 pp. In Flora of Canada. National Museums of Canada, Ottawa.〕〔Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada. New York Botanical Garden, New York. 〕
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