The federally-endangered species Dalea foliosa (leafy prairie clover) is a short-lived herbaceous perennial found in dolomite prairie. In Illinois, only five populations are known including one at the Midewin National Tallgrass Prairie (MNTP). In this paper, I present the results of a third year of reproductive success data and determine variation between years in reproductive success for this small isolated population. As in 1998 and 1999, 2000 reproductive success was high, although variation between years was found. Although the studied population of D. foliosa is small, isolated, and found in a fragmented habitat, these conditions do not appear to affect reproductive success.