Common St. John's wort
(Hypericum perforatum)

This common field weed is introduced. It stands to 30 in. high, with acute or oblong stemless leaves, which measure less than 1 inch in length. Flowers have small black dots along the petal edges only, and closely-examined leaves have numerous translucent dots and a few black spots as well. A similar, native species, H. punctatum, has rounded leaves greater than one inch in length, and black spots scattered across the petals. MC (Clusiaceae)