New York Flora Association
an organization dedicated to the promotion of field botany and greater understanding of the plants that grow in the wild in New York State.website: http://www.nyflora.org/
NY Flora Atlas: http://www.newyork.plantatlas.usf.edu/Default.aspx
USDA PLANTS Database
The PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories.
This is a map of New York that marks places that have a plant list available.