Common Sowthistle - Sonchus oleraceus
Smooth Sow Thistle, Hare's Colwort, Swinies, Annual Sowthistle
Taprooted annual. Stems erect, 30–100 cm tall, mostly simple. Leaves lanceolate to oblanceolate, pinnately lobed to mostly entire, 5–25 cm long, winged-petiolate below, becoming sessile and auriculate above. Involucres 8–15 mm high; phyllaries glabrous or with patches of tomentum. Ray ligules 3–6 mm long, inconspicuous. Achenes brown, 2–4 mm long, bumpy between the ribs (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
From Eurasia but widespread across nearly all of North America.
Observations in Montana Natural Heritage Program Database
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.