Common St. Johnswort
    or St. John's-wort
Common St. Johnswort
    or St. John's-wort
Hypericum perforatum
St. Johnswort Family - Hypericaceae
Branching terminal clusters of golden yellow flowers (3/4 to 1" wide) with slightly fringed petals with black dotted margins. Numerous stamens. 
(Photographed - July)
Leaves narrow, 1 to 1.5 inch long, opposite and smoothly margined.
  Pathology Images Inc. 2000 to 2002