Helianthus agrestis is a species of sunflower known by the common name southeastern sunflower. It is one of 150 sunflower species in the genus Helianthus. It is found only in the states of Florida and Georgia in the southeastern United States. This plant is native to Florida. It grows in wet soil in marshes and pine flatwoods at elevations less than 50 meters (170 feet) elevation.

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