Sorrel is the common name for Roselle (Hibiscus sabdariffa) also called Florida cranberry.
Sorrel is an annual plant that flowers and fruits in one year with 2 bearings and then dies off. The flowers are creamy yellow with a scarlet throat and look like a small Hibiscus flower and the fruit usually comes in time for Christmas. About 3 weeks after flowering the fruit is ready for harvesting.
I have noticed a change in the bearing season pattern where Sorrel comes into fruit early.