Field Sow Thistle
Field Sow Thistle
Sonchus arvensis
Sunflower Family - Asteraceae
Leaves with many spiny teeth. Leaves may be entire or with deep, smoothly curved, notched lobes. Base of leaves heart-shaped and projecting around the grooved stem.

(Photographed - July)
A bright yellow dandelion-like flower head (about 1" wide) with all ray flowers.
  Pathology Images Inc. 2000 to 2002