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Agalinis acuta
http://ridgwaydb.mobot.org/cpcweb/CPC_ViewProfile.asp?CPCNum=36
Image and description of Sandplain Gerardia.
Agalinis aspera (Rough Gerardia)
http://www.npwrc.usgs.gov/resource/literatr/wildflwr/species/agalaspe.htm
Image and description.
Agalinis purpurea (Purple False Foxglove)
http://www.illinoiswildflowers.info/prairie/plantx/pf_foxglovex.htm
Physical characteristics, range, habitat, and associated fauna. Includes images.