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Arethusa bulbosa
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ARBU
Images and US range of dragon's mouth.
Arethusa bulbosa
http://www.ct-botanical-society.org/galleries/arethusabulb.html
Large flower image.
Arethusa bulbosa L.
http://www.botany.wisc.edu/Orchids/Arethusa.html
Description and images.