Senecio vulgaris groundsel; ragwort Asteraceae SEVU*; Bx, pb, vc; NY, bl (Stalter and Tang 2002), hb; Q, i, j, lk; K, p; R, hs, mm;

 

Senecio vulgaris.en.wikipedia.org

Senecio vulgaris.en.wikipedia.org (Accessed 4/2014).

Senecio vulgaris is an annual herb, summer or winter, 10-40 cm, from a taproot, stems leafy, branching, young plant somewhat cobwebby, later almost hairless. 

Leaves alternate, hairy somewhat fleshy, narrow, irregularly, pinnately lobed 2-10 cm long, 0.5-4.5 cm wide, lobes toothed, lower leaves tapering to a stalk, upper leaves stalkless, clasping stem. 

Flowers yellow, all tubular, no rays, heads 0.8-1 cm high, cylindrical, higher than wide, outer bracts very short, usually black-tipped, inner bracts linear, black-tipped, almost as long as flowers; bristles of achene longer than flowers, heads in branched clusters, self-fertile (autogamous), but visited by some insects (Mulligan and Kevan 1973; Robinson et al. 2003); blooming May-Oct. 

Fruit dry achenes white-plumed, wind dispersed. 

Wetland status: FACU. 

Frequency in NYC: Occasional. 

Origin: Old world. 

Habitat: Open areas, lawns, roadsides, edges, fill, soil pH 5-8.5; Intolerant of drought, salt, fire and heat (USDA, NRCS 2010). 

Notes: Plants eaten by rabbits and other small herbivores. Contains toxic pyrrolizidine alkaloids (Uva et al. 1997). Some insects accumulate these toxins which discourages predators; historically groundsel has been used as a medicine (Robinson et al. 2003).