[
Sow Thistles: The Genus
Sonchus
in the Mountains and Deserts of the American Southwest
]
Prickly Sow Thistle, Sow Thistle
Sonchus asper
ssp.
asper
-
-
Prickly sow thistle observed near Pena Springs, Anza-Borrego Desert State Park, CA......March 31, 2006.
Paul Slichter