Red or Pink Wildflowers with Four Petals: Wildflowers of the National Capital Region

Callicarpa americana

Cardamine angustata

Cardamine concatenata

Cardamine douglassii

Clematis viorna

Clinopodium vulgare

Diodia teres

Epifagus virginiana

Galium pilosum

Galium sherardia

Hesperis matronalis

Oenothera speciosa

Rhexia mariana

Rhexia virginica