Increasing alfalfa forage yield is a priority of the Iowa State forage-breeding program. One way to increase yields may be to develop hybrid alfalfa cultivars. Crosses between common, purple flowered (sativa) alfalfa and wild, yellow-flowered (falcata) alfalfa often produce hybrids that have significant yield improvements. The objective of this experiment was to identify falcata populations that produce hybrids superior to sativa cultivars or hybrids.