I was thinking we could narrow the field to your national and/or state flowers (Hibiscus is the Hawaiian State flower) but I don't know if that is terribly limiting especially being that those in the Northern Hemisphere would be heavilly handicapped in this challenge (if they didn't already have their flower taken from before) given the time of year. Comments?
For USA residents here's a head-start on what to look for: http://www.50states.com/flower or you can take a picture of a rose (our national flower)
For those in other places you're on your own to research the right flower... or make it up I suppose. If you don't know, how are we to really know if you're wrong?