Alkali Sandspurry: Spergularia diandra - Annual. Leaves fleshy, not tipped with a sharp, narrow point. Leaves less than 1 mm wide. Herbage with many gland-tipped hairs throughout.
Red Sandspurry, Sand Spurry: Spergularia rubra (Synonym: Arenaria rubra) - Annual. Leaves not fleshy, but tipped with a sharp, narrow point. Leaves generally more than 1 mm wide. Herbage glabrous or with some gland-tipped hairs above.
Salt Sandspurry, Saltmarsh Sandspurry: Spergularia salina var. salina (Synonyms: Spergularia marina, Spergularia marina var. tenuis, Spergularia salina var. tenuis)