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Helianthus divaricatus : ウィキペディア英語版 | Helianthus divaricatus
''Helianthus divaricatus'', commonly known as the woodland sunflower or rough woodland sunflower,〔Dickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004) ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 170.〕 is a North American species perennial herb in the composite family. It is native to central and eastern North America, from Ontario and Quebec in the north, south to Florida and Louisiana and west to Oklahoma and Iowa.〔(Biota of North America Program 2014 county distribution map )〕 ''Helanthus divaricatus'' commonly occurs in dry, relatively open sites. The showy yellow flowers emerge in summer through early fall. The woodland sunflower is similar to ''Helianthus hirsutus'', but its stem is rough. It is up to 1.5 m tall with short stalked, lanceolate to oval leaves, 1–8 cm wide with toothed margins. Its flowers have 8 to 15 rays, each 1.5 to 3 cm (0.6-1.2inches) long, surrounding an orange or yellowish brown central disk.〔 ==References==
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