Phlox paniculata and Phlox divaricata
Similar to Hesperis matronalis L.
Phlox paniculata, Summer or Tall Phlox, and Phlox divaricata, Woodland or Blue Phlox, have flowers with five petals rather than four and do not produce thin seed pods (siliques). The leaves and stems of these Phlox plants are not hairy. Woodland Phlox flowers in April before Dame's Rocket, and Summer Phlox flowers later in July.