There are several species with some annuals and some perennials. They are a serious problem in turf, pastures, and alfafa. They all have 4-petaled flowers varying in color from pale violet to deep blue. The capsule is a distinctive heart shape.
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension