WHAT FLORIDA NATIVE PLANT IS BLOOMING TODAY?: COMMON YELLOW WOODSORREL; CREEPING WOODSORREL (Oxalis corniculata)
While there are many oxalis species which grow in Florida, the two that are yellow are the natives, while the pink and purple are non-native.
Enjoyed by early pollinators. Said to be edible in small quantities.
My take as a native substitute for shamrocks: http://web.archive.org/web/20120319052056/http://www.beautifulwildlifegarden.com/native-shamrocks.html
Native American Ethnobotany: http://herb.umd.umich.edu/herb/search.pl/?searchstring=Oxalis+corniculata