Annuals, 10-70(-100) cm. Stems erect. Leaves: petioles 0-1 mm; blades linear to filiform, 10-35(-60) × 0.6-1.5(-3) mm, margins entire, faces ± scabrellous, gland-dotted. Heads in ± spiciform arrays. Peduncles 0.5-1 mm. Involucres hemispheric, 1.5-2 mm. Phyllaries: outer 5 distinct, ± herbaceous. Paleae cuneiform to setiform, 1-2 mm. Pistillate florets 2-3+; corollas 0.5-0.8 mm. Functionally staminate florets 3-5; corollas 1.8-2 mm. Cypselae 1-1.5 mm. 2n = 32. Flowering Sep-Nov. Disturbed sites, moist or wet soils; 1-100 m; Ala., Fla., Ga., N.C., S.C.