This is Polanisia dodecandra, also known as Dwarf Cleome, Clammy Weed, and Clammyweed. This annual plant should be grown in the full sun where it will grow best and where it will attract the most birds, bees, and butterflies. It blooms repeatedly from the middle of the Spring until the early Fall. Clammyweed is a larval host plant for the Checkered White, Florida White and Great southern White butterflies, and it is a nectar source for countless others.