Leaves mostly linear, 2-5 mm wide, margins usually entire or obscurely serrulate. 2n = 20, 30. Flowering Aug-Oct. Dry, open, disturbed sites, along roadsides; 10-200+ m; Ala., Ark., Conn., Del., Fla., Ga., Ill., Ky., La., Md., Mass., Miss., Mo., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Tex., Va., W.Va., Wis.