Premise: Paysonia stonensis (syn. "Lesquerella stonensis") is a species of flowering plant in the mustard family, known by the common name Stones River bladderpod. It is endemic to Tennessee in the United States, where it is limited to Rutherford County. It grows only in the floodplains of the Stones River, and certain tributaries.
Hypothesis: Agent: 
Paysonia stonensis (syn. "Lesquerella stonensis") is a species of flowering plant in the mustard family, known by the common name Stones River bladderpod. The plant need lots and lots of water.