Sonchus arvensis (Field Sowthistle)
Family:
Asteraceae (Sunflower)
Noxious Weed!
     
Sonchus arvensis can be distinguished from other Sonchus spp. by the yellow glandular hairs on the bracts below the flower heads. Leaves are lobed, toothed and somewhat spiny. Flowers look like large dandelions. Plants can grow to a height of several feet. Plants have a milky juice.

Compare to Sonchus oleraceus, which has broader, deeply lobed leaves and lacks glandular hairs on the flower head bracts.
Compare to Sonchus asper, which has spiny leaves with large lobes clasping the stem and lacks glandular hairs on the flower head bracts.


Vegetation zone:  Plains, Foothills
Time of bloom:  July - October
Origin:  Introduced  Noxious Weed