1	"Stamens 6–10; plant perennial with usually thick, woody taproot; sepals usually 4 mm or more long, or if less then stipules often 6–8 mm long"	2
1	"Stamens 1–5 (rarely absent); if more, then plant annual, biennial or rarely short-lived perennial with more or less slender taproot and/or sepals usually less than 4 mm long; stipules rarely more than 4 mm long"	7
2	"Mature seeds yellow-brown to dark red-brown"	3
2	"Mature seeds black"	6
3	"Leaves more or less prominently awned; stipules (3–) 6–8 mm long; capsules usually 3.5–5 mm long"	4
3	"Leaves acute, mucronate or shortly awned; stipules 2.5–3.5 mm long; capsules usually 4.5–9 mm long"	5
4	"Internodes mostly 5–10 mm long; petals distinctly shorter than sepals, white; capsules much longer than sepals; seeds dark red-brown, not papillose, usually scariously winged, or occasionally unwinged or wing vestigial"	"Spergularia villosa"
4	"Internodes mostly 15–25(–40) mm long; petals c. equalling sepals, pink; capsules c. equalling to slightly longer than sepals; seeds yellow-, olive- or grey-brown, prominently and coursely papillose, never winged"	"Spergularia brevifolia"
5	"Mature seeds usually 0.6–0.8 mm long with marginal papillae distinctly paler than testa, unwinged or winged, often both in the same capsule"	"Spergularia marina"
5	"Mature seeds usually 0.7–1.1 mm long, without papillae, usually scariously winged, occasionally a few unwinged"	"Spergularia media"
6	"Leaves sparsely glandular-ciliate; stipules scarcely acuminate, not silvery; petals c. 4 mm long, much shorter than sepals; capsules 4.5–8 mm long, consistently longer than sepals; seeds 0.7–1.1 mm long, tuberculate or bluntly papillose, mostly scariously winged"	"Spergularia tasmanica"
6	"Leaves, at least the upper, uniformly glandular-hairy; stipules acuminate, more or less silvery; petals 4–6 mm long, c. equalling to slightly exceeding sepals; capsules 4.5–7 mm long, slightly shorter to slightly longer than sepals; seeds 0.5–0.75 mm long, more or less smooth to densely and coarsely papillose, unwinged"	"Spergularia brevifolia"
7	"Mature seeds pale grey-brown through orange-brown to dark brown, mostly lacking metallic-iridescent lustre, smooth to tuberculate or rather sparsely and finely papillose"	8
7	"Mature seeds very dark grey-brown to pitch-black, usually with metallic-iridescent lustre, or if not lustrous then very densely blunt-papillose"	10
8	"Leaf-apex obtuse to mucronulate, never awned; calyx base with prominent purple-black dots; capsules narrow-ovoid, usually 4–6.5 mm long, usually much exceeding sepals; seeds usually 0.6–0.8 mm long, orange-brown to deep red-brown with marginal papillae distinctly paler than testa, unwinged or scariously winged, often both in the same capsule"	"Spergularia marina"
8	"Leaf-apex mucronate to prominently awned; calyx-base with dots obscure or absent; capsules ovoid to subglobose, usually 2–4 mm long, equalling or slightly exceeding sepals; seeds usually 0.35–0.55 (–0.6) mm long, light to dark grey-brown with papillae not or hardly paler than testa, unwinged"	9
9	"Leaves not fasciculate; leaf-apex mucronate to shortly awned; stipules neither acuminate nor silvery; pedicels usually shorter than to equalling sepals and capsules; glandular hairs of sepals usually 0.3–0.4 mm long; petals usually 2–2.5 mm long, white, or pink inside; stamens usually 2–5; capsules usually 2–3.5 mm long; seeds light grey-brown"	"Spergularia bocconei"
9	"Leaves strongly fasciculate; leaf-apex long-awned; stipules acuminate, silvery; pedicels distinctly longer than sepals and capsules; glandular hairs of sepals usually 0.1–0.25 mm long; petals usually 2.4–3.8 mm long; uniformly pink; stamens usually 10; capsules usually 4–5 mm long; seeds dark grey-brown"	"Spergularia rubra"
10	"Leaves glabrous; petals usually 1.8–2 mm long; stamens usually 2–3; seeds 0.45–0.5 mm long, colliculate, tuberculate or finely papillose, rarely entirely smooth"	"Spergularia diandra"
10	"Leaves sparsely glandular-hairy; petals usually 2–2.5 mm long; stamens usually 6–8; seeds usually 0.5–0.7 mm long, more or less smooth to coarsely and densely blunt-papillose"	"Spergularia brevifolia"