In October of 2009 the Center for Plant Conservation hosted a conference on evaluating plant reintroductions. As a result they established a Reintroduction Registry to enter and view projects that have reintroduced native plants into known or new habitats. There is an example of one New York State orchid, Prairie Fringed Orchid, Platanthera leucophaea, that was reintroduced into a restored prairie. Maybe you have an example of a plant reintroduction that you could share with others on this site.