This is the common Partridge Pea (Chamaecrista fasciculata), aptly named because this legume is an important Winter food source for quail as well as other bird species and mammals. It's found in open meadows (often included in seed mixes used for conservation plantings), roadsides, and waste places. It's leaves are light sensitive and fold at night, giving rise to another of its common names, Sleeping Plant. --Wendy Butler Burt