Proximal scale 1.2-2 × 0.8-1 mm. Flowers: perianth bristles 6, colorless, white or rarely pale or red-brown, 0.6-1 mm, shorter than to equaling achene; spinules retrorse, minute, barely evident at 45X. Achenes 0.35-0.5 mm wide. Tubercles pyramidal or birettaform, 0.1-0.2 × 0.1-0.3 mm. 2n = 10. Fruiting spring-fall. Fresh, wet places in clearings in pine woods, depressions in cypress-black gum forests, lakeshores; 0-600 m; Ala., Fla., Ga., Ind., La., Md., Mass., Mich., Miss., N.J., N.C., Pa., S.C., Tenn., Tex., Va.