Senecio sylvaticus is a species of flowering plant in the aster family. It is variously known as the woodland ragwort, heath groundsel, or mountain common groundsel. It is native to Eurasia, and it can be found in other places, including western and eastern sections of North America, as an introduced species and an occasional roadside weed. It grows best in cool, wet areas. It is an annual herb producing a single erect stem up to 80 centimeters tall from a taproot. It is coated in short, curly hairs. The toothed, deeply lobed leaves are up to 12 centimeters long and borne on petioles. They are evenly distributed along the stem. The inflorescence is a wide, spreading array of many flower heads, each lined with green- or black-tipped phyllaries. The heads contain yellow disc florets and most have very tiny yellow ray florets as well.
- "Senecio sylvaticus". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 10 November 2015.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
- Baynes, T.S.; Smith, W.R., eds. (1880). "Groundsel". Encyclopædia Britannica. 11 (9th ed.). New York: Charles Scribner's Sons. p. 221.
|Wikisource has the text of the 1911 Encyclopædia Britannica article Groundsel.|
- Media related to Senecio sylvaticus at Wikimedia Commons
- Jepson Manual Treatment
- Flora of North America
- Washington Burke Museum
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