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Helianthus giganteus : ウィキペディア英語版 | Helianthus giganteus
''Helianthus giganteus'' (giant sunflower or tall sunflower), is a species of ''Helianthus'' native to the eastern United States and eastern and central Canada, from Newfoundland west to Alberta south to Minnesota, Mississippi, and South Carolina.〔Germplasm Resources Information Network: (''Helianthus giganteus'' )〕〔(Biota of North America Program 2014 county distribution map )〕〔 Helianthus giganteus is a perennial herbaceous plant growing up to 4 m (over 13 feet) tall. The leaves are slender, lanceolate. The flower heads are bright yellow, up to 7 cm (2.8 inches) in diameter. They are most commonly found in valleys with wet meadows or swamps.〔Wisconsin Plant of the Week: (''Helianthus giganteus'' )〕〔(Flora of North America, ''Helianthus giganteus'' Linnaeus, 1753. Giant or tall sunflower, hélianthe géant )〕 ==References==
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