Definitely looks like a spiderwort. Might be hard to get a positive ID without more information, but take a look at Tradescantia fluminensis, an introduced species that is found in Florida. For example, see http://keyserver.lucidcentral.org/weeds/data/03030800-0b07-490a-8d04-0605030c0f01/media/Html/Tradescantia_fluminensis.htm
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