Ipomoea purpurea
http://davesgarden.com/guides/pf/showimage/22914/
Ipomoea tricolor "Flying Saucers"
http://davesgarden.com/guides/pf/showimage/168334/
http://en.wikipedia.org/wiki/Ipomoea_tricolor
Ipomoea violacea
http://davesgarden.com/guides/pf/go/57559/
scroll down the above page to read comments
Ipomoea violacea - Beach Moonflower
http://www.ars-grin.gov/cgi-bin/npgs/html/tax_search.pl
1) Ipomoea violacea L. - This is the entry that is Legitimate
http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?20238
please scroll to bottom of entry and click onto seeds and fruit - take note of who donated the images
2) Ipomoea violacea auct. (=Ipomoea tricolor Cav.) - auct = misapplied by authors, so, Ipomoea violacea is only related to Ipomoea tricolor when it is misapplied by authors (!)
http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?20231
Ipomoea violacxea - Please read entire lower section on misapplied names and confusion with I.tricolor
http://en.wikipedia.org/wiki/Ipomoea_violacea
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