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''Heliopsis helianthoides'' is a species of flowering plant in the family Asteraceae, known by the common names smooth oxeye and false sunflower.〔(''Heliopsis helianthoides''. ) USDA NRCS Plant Guide.〕 It is native to eastern and central North America from Saskatchewan east to Newfoundland and south as far as Texas, New Mexico, and Georgia.〔(''Heliopsis helianthoides''. ) Flora of North America.〕〔(''Heliopsis helianthoides''. ) Missouri Botanical Garden, Gardening help〕〔(Biota of North America Program 2014 county distribution map )〕 ''Heliopsis helianthoides'' is a rhizomatous herbaceous perennial growing tall. The toothed leaf blades are oval to triangular or lance-shaped and may be smooth or hairy or rough in texture. The flowers are produced from midsummer to early autumn (fall). The inflorescence contains one to many composite flowerheads. Each head contains yellow ray florets which are generally 2–4 cm (0.8-1.6 inches) long. At the center are many yellow to brownish disc florets. The fruit is an achene about 5 mm long.〔 In the wild, ''H. helianthoides'' may be found in wooded areas and tallgrass prairie, and sometimes along roadsides.〔 It is a popular garden plant, and several cultivars are available with flowers of varying colors and shades. These include 'Summer Sun', 'Golden Plume', and 'Prairie Sunset'.〔 The following cultivars of ''H. helianthoides'' var. ''scabra'' ("rough") have gained the Royal Horticultural Society's Award of Garden Merit:- * 'Benzinggold'〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=944 )〕 * 'Light of Loddon'〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=3060 )〕 * 'Spitzentänzerin'〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=3062 )〕 * 'Waterperry Gold'〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=4760 )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heliopsis helianthoides」の詳細全文を読む スポンサード リンク
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