About Plants
Illinois Wildflowers: http://www.illinoiswildflowers.info/
University of Illinois Extension Wildflowers: http://urbanext.illinois.edu/wildflowers/
Missouri Botanical Garden PlantFinder: http://www.missouribotanicalgarden.org/plantfinder/plantfindersearch.aspx
USDA National Science Conservation Center PLANTS Database: http://plants.usda.gov/
Discover Life Wildflowers Guide Search: http://www.discoverlife.org/mp/20q?guide=Wildflowers
Ecology and Management of Invasive Plants Program (Cornell University): http://www.invasiveplants.net/
Global Invasive Species Database (GISD): http://www.issg.org/database/welcome/
Other Helpful Information
Web Soil Survey: http://websoilsurvey.nrcs.usda.gov
Official Soil Series Descriptions (OSD): https://soilseries.sc.egov.usda.gov/
Federal Township Plats of Illinois (1804-1891): http://landplats.ilsos.net/ftp_illinois.html
Natural Resources Conservation Service – Illinois: http://www.nrcs.usda.gov/wps/portal/nrcs/site/il/home/
Field Office Technical Guide (FOTG) – About: http://www.nrcs.usda.gov/wps/portal/nrcs/main/national/technical/fotg
Illinois Cooperative Agricultural Pest Survey: http://www.inhs.uiuc.edu/research/CAPS/