1. Sepals at least 4 mm long (usually 5); seed with a thin wing ca. 0.3 mm broad.

S. media

1. Sepals mostly not over 4 mm (usually 2-3.5); seed usually wingless.

2. Stamens 1-3 (rarely more); plant of saline habitats.

S. marina

2. Stamens usually 10 (or some aborted); plant of non-saline habitats.

S. rubra