Cichorium intybus
Sunflower Family - Asteraceae
Leaves variable in size and shape with larger and basal ones lobed or toothed and possibly clasping the stem.
(Photographed - late July)
Blue, stalkless flowerheads (~1.5" wide) spaced along a stiff stem. Only ray flowers present with square-tipped petals having many distinct notches and with dark blue fused anthers.
  Pathology Images Inc. 2000 to 2002