Blue or Purple Wildflowers with Four Petals
Callicarpa americana
Clematis viorna
Clinopodium vulgare
Cunila origanoides
Diodia teres
Galium sherardia
Hesperis matronalis
Houstonia caerulea
Houstonia longifolia
Houstonia pusilla
Rhexia mariana
Rhexia virginica
Veronica arvensis
Veronica hederifolia
Veronica officinalis
Veronica polita
Veronica serpyllifolia