Common name: Ragwort
Senecio jacobaea L. APNI*
Description: Perennial or biennial rhizomatous herb, mostly 30–80 cm high, unbranched except below inflorescence, at first cobwebby and then ± glabrous.
Lower leaves usually lyrate-pinnatifid; middle leaves bipinnatisect with ± linear lobes; leaves mostly 6–12 cm long, 20–60 mm wide, upper surface glabrous, lower surface ± cobwebby; petiole-like base mostly 10–30 mm long.
Inflorescence corymbose; heads broad-campanulate, 5–7 mm diam., ± glabrous except at apices; involucral bracts c. 13, 5–6 mm long; bracteoles 2–6. Ray florets 12–15; ligules 6–9 mm long.
Achenes c. 2 mm long; ray achenes glabrous, disc achenes hairy; pappus 5–6 mm long, persistent only in disc florets.
Distribution and occurrence: Weed, collected at Kangaloon and Goulburn, rare in this State. Native of Europe & Asia.
NSW subdivisions: *CT, *SC, *ST, *CWS
Other Australian states: *Vic. *Tas. *W.A. *S.A.
Declared Noxious Weed
Text by G. J. Harden
Taxon concept: Flora of NSW 3 (1992)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.