*Sonchus Linnaeus. Sow-thistle, Milk-thistle.
A genus of about 50-60 species, herbs and shrubs, of the Old World.
ID notes:Distinguished from Lactuca by its beakless cypselae. Sonchus also tends to have more florets per head (often 80+).
Ref: Cronquist (1980); Hyatt (2006) In Flora of North America Editorial Committee (2006a). Show full citations.
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