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Lobelia cardinalis
http://www.botany.hawaii.edu/faculty/carr/images/lob_car.jpg
Image of cardinal flower blossom.
Lobelia cardinalis
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=LOCA2
Cardinal flower. Images, US range, and links.
Lobelia gaudichaudii
http://www.botany.hawaii.edu/faculty/carr/images/lob_gau.jpg
Photograph of plant.
Lobelia inflata
http://www.ct-botanical-society.org/galleries/lobeliainfl.html
Description and image from Connecticut.