Are these plants native?
No, none of these plants are native to Maryland. Anise hyssop is native the U.S. (Great Plains). Little bluestem, the straight species (Schizachyrium scoparium), is native to Maryland, but the one listed here ('Standing Ovation') is a cultivated variety. Some tickseeds (Coreopsis tripteris and Coreopsis verticillata) are native.
Here are some good resources and references for Maryland native plants.