There are 17 species of tick trefoil in New Jersey and they all share the flat, triangular seed that sticks like a tick. Flower is typical legume and varies from white through violet to blue.
![Photo of Tick Trefoil Seed Pod](images/large/ticktrefoil-full.jpg)
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension