Helianthus divaricatus var. angustifolius Kuntze
Helianthus divaricatus, commonly known as the rough sunflower, woodland sunflower or rough woodland sunflower, 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.
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.
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- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
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- Dickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004) ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 170.
- Biota of North America Program 2014 county distribution map
- Schilling, Edward E. (2006). "Helianthus divaricatus". In Flora of North America Editorial Committee, eds. 1993+. Flora of North America. 21. New York & Oxford: Oxford University Press. p. 157.
- "Helianthus divaricatus". Integrated Taxonomic Information System. Retrieved 30 August 2008.
- Distribution Map from Flora of North America
- Missouri Plants
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