Herbs annual or biennial, rarely perennial, with slender or slightly fleshy stock. Stems 10--30 cm tall, densely pubescent. Leaves not or rarely fasciculate, 5--30 × 1--1.5 mm, fleshy, apex mucronate; stipules not silvery, broadly triangular, forming a sheath. Flowers terminal or axillary; bracts reduced. Sepals ovate, ca. 3.5 × 1.5--1.8 mm, abaxially glandular pubescent, margin membranous. Petals pink above, white near base, rarely entirely white, ovate-oblong or elliptic-ovate, shorter than sepals, apex obtuse. Stamens 2--5. Capsule 5--6 mm, ovoid, usually exceeding calyx. Seeds light brown, 0.5--0.7 mm, smooth or densely tuberculate, mostly unwinged, sometimes with erose wing. Fl. Apr--Jul, fr. May--Sep. 2n = 36.
"Simple or much-branched annual, erect or prostrate, to 35 cm, glabrous to glandular-puberulent; lvs 5–40 × 0.5–1.5 mm, fleshy, short-mucronate; stipules deltoid, 2–4 mm; sep ovate, 2.5–5 mm, obtuse; pet white or pink, ovate, shorter than the sep; stamens 2–5; fr equaling or surpassing the cal; seed 0.6–0.8 mm, smooth or glandular-papillate, wingless or occasionally with an erose wing to 0.4 mm wide; 2n=36. Native of Eurasia, probably only intr. in Amer.; coastal brackish and saline marshes, and flat and alkaline areas inland; salted highways in O. and Mich.; Que. to B.C., s. to Fla. and Baja Calif. June–Sept. (S. leiosperma; S. salina; Tissa m.)"