Sonchus arvensisL. [family ASTERACEAE ] (stored under name); Verified by Not on sheet, Sonchus arvensisL. [family ASTERACEAE ] Verified by Not on sheet,
Related name
Sonchus arvensis
Sonchus fauriei
Sonchus reversus
Sonchus brachyotus
Sonchus
Embergeria megalocarpa
Sonchus uliginosus
Sonchus megalocarpus
Sonchus asper
Sonchus oleraceus
Sonchus nymanii
Sonchus picris
Sonchus circular
Sonchus wightianus
Common name
Field sow-thistle, Flora of North America Vol. 19
laiteron des champs, Flora of North America Vol. 19
Flora
Entry for Sonchus arvensis Linnaeus [family COMPOSITAE]
Perennials, 0–150(–200) cm, usually rhizomatous or stoloni-ferous. Stem bases hard, some-times ± woody. Leaves: blades of mid cauline oblong to lanceolate, (3–)6–40 × 2–15 cm, bases auriculate, auricles straight or curved, rounded, margins usually pinnately lobed, lobes ± deltate, not constricted at bases, terminals usually larger than laterals, dentate or entire. Peduncles sessile- or stipitate-glandular. Involucres 10–17+ mm. Phyllaries sessile- or stipitate-glandular. Corollas: ligules ± equaling tubes. Cypselae dark brown, oblanceoloid to ellipsoid, 2.5–3.5 mm, ribs 4–5(+) on each face, faces transversely rugulose to tuberculate across and between ribs; pappi 8–14 mm. 2n = 36, 54.
Distribution
Europeintroduced also in South AmericaAsiaAfricaPacific Islands (New Zealand)Australia.
Discussion
Sonchus arvensis is introduced in temperate regions of all continents. Plants of the species prefer relatively cooler, moister climates and are more abundant in the northern part of North America.
