Almost all of Florida's 24 milkweeds are native, and at least two of them are native only to Florida (endemic). Milkweeds are frequently encountered throughout the state, and the rest of North America. Different species are found in very wet habitats as well as in very dry ones.
This one is Florida milkweed. It occasionally is found in wet flatwoods and floodplain forests, from Orlando to Pensacola; it also occurs from Texas to Virginia (Kartesz, 1999). It flowers from spring through summer (Wunderlin, 2003).