Helianthus divaricatus

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Helianthus divaricatus
Helianthus divaricatus 7718.jpg

Secure (NatureServe)[1]
Scientific classification
H. divaricatus
Binomial name
Helianthus divaricatus

Helianthus divaricatus var. angustifolius Kuntze

Helianthus divaricatus, commonly known as the rough sunflower,[3] woodland sunflower,[4] or rough woodland sunflower,[5] 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.[6]

Helanthus divaricatus commonly occurs in dry, relatively open sites. The showy yellow flowers emerge in summer through early fall.[7]

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 (0.6-1.2 inches) long, surrounding an orange or yellowish brown central disk.[5]


  1. ^ "Helianthus divaricatus". NatureServe Explorer. NatureServe. Retrieved 2008-08-30.
  2. ^ The Plant List, Helianthus divaricatus L.
  3. ^ "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  4. ^ "Helianthus divaricatus". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 19 January 2016.
  5. ^ a b Dickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004). ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 170.
  6. ^ Biota of North America Program 2014 county distribution map
  7. ^ Schilling, Edward E. (2006). "Helianthus divaricatus". In Flora of North America Editorial Committee, eds. 1993+ (ed.). Flora of North America. 21. New York & Oxford: Oxford University Press. p. 157.

External links[edit]

Media related to Helianthus divaricatus at Wikimedia Commons Data related to Helianthus divaricatus at Wikispecies