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Polygala
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=POLYG
Information, range maps, and photos for U.S. species.
Polygala dalmaisiana
http://www.botany.hawaii.edu/faculty/carr/images/pol_dal_fl.jpg
image
Polygala myrtifolia
http://www.dipbot.unict.it/orto/1058-1.html
image
Polygala paniculata
http://www.botany.hawaii.edu/faculty/carr/images/pol_pan_fl.jpg
image