GOAT'S RUE AND ANTS, the little specks are aphids
http://www.missouriplants.com/Others/Tephrosia_virginiana_page.html
Flowering - May - August.
Habitat - Rocky open woods, glades, prairies.
Origin - Native to U.S.
Other info. - T. virginiana is a very striking and important plant. The large roots contain nitrogen fixing bacteria and also rotenone, the latter being used as an insecticide and fish poison. Traditionally, the plant had been used to treat many ailments such as tuberculosis, rheumatism, and bladder troubles. The plant has also been studied in cancer research.
Steyermark stated that the plant "does not transplant successfully" and doesn't really take from seed either because of the special relationships and requirements the plant has with the acid soil in which it grows