Stems slender or rather stout, branched, annual, smooth or somewhat roughish, 8 to 25 inches high with ascending or spreading branches. Leaves opposite, narrowly linear, 1 to 2 inches long. Flowers purple or rarely white, racemose on the branches, their stalks very short. Calyx bell-shaped with five pointed, triangular-ovate teeth about half the length of the tube. Corolla with a bell-shaped tube and a spreading, five-lobed and slightly two-lipped limb, hairy without and more or less so within. Stamens four, attached to the corolla tube within and not projecting out of the flower. Fruit a globose capsule somewhat longer than the calyx.
In moist fields and meadows, Maine to Florida, most abundant in the coastal region, but also found westward to Wisconsin and Missouri.
Memoir 15 N. Y. State Museum
Large Purple Gerardia - Agalinis purpurea