Stems annual, rather widely branched and pubescent with spreading hairs or nearly smooth, 1 to 2 feet high. Leaves with a sessile gland on the petiole, sensitive, similar to the preceding species but the twenty to thirty leaflets somewhat larger. Flowers two to four together in the axils, 1 to 1 ½ inches broad and slender-pediceled; calyx lobes long pointed; petals yellow, sometimes purple spotted; stamens ten, all perfect; four of the anthers yellow, six of them purple. Fruit a linear, pubescent, or glabrous flattened pod, 1 ½ to 2 ½ inches long and one-fourth of an inch wide or less.
In dry or sandy soil, Massachusetts to Florida, Minnesota, Texas and Mexico. Flowering from July to September.
Memoir 15 N. Y. State Museum
B. Partridge Pea; Large-Flowered Sensitive Pea - Chamaecrista fasciculata