Alkali Sandspurry, Alkali Sand-spurrey: Spergularia diandra - Leaves mostly less than 1 mm wide. Leaf axils lack small bundles of leaves.
Red Sand-spurrey, Sand Spurry: Spergularia rubra (Synonym: Arenaria rubra) - Leaves often more than 1 mm wide. Stamens 10. Small bundles of leaves in the axils of the major leaves,
Salt Sandspurry, Saltmarsh Sandspurry, Salt-marsh Sand-spurrey: Spergularia marina (Synonyms: Spergularia marina var. tenuis, Spergularia salina, Spergularia salina var. salina) - Leaves often more than 1 mm wide. Stamens 2-5. Leaf axils lack small bundles of leaves.