1	"Stipules present"	2
1	"Stipules absent"	7
2	"Fruit an achene enclosed by the persistent calyx"	3
2	"Fruit a capsule, dehiscing by 3–5 teeth or valves"	5
3	"Leaves all alternate"	"Corrigiola {Corrigiola litoralis}"
3	"Leaves mostly opposite"	4
4	"Stipules and bracts small, latter much shorter than flowers; seeds lenticular, shining"	"Herniaria {Herniaria cinerea}"
4	"Stipules and bracts conspicuous, latter more or less obscuring flowers; seeds subglobose, not shining"	Paronychia
5	"Leaves usually ovate or obovate to more or less spathulate; seeds never winged or keeled"	"Polycarpon {Polycarpon tetraphyllum}"
5	"Leaves linear to terete; seeds sometimes winged or keeled"	6
6	"Styles 5; capsule 5-valved; seeds lenticular, often white-papillose"	Spergula
6	"Styles 3; capsule 3-valved; seeds not lenticular, never white-papillose"	Spergularia
7	"Fruit an indehiscent nutlet; petals absent"	Scleranthus
7	"Fruit a capsule, dehiscing by teeth or valves; petals usually present (absent in Colobanthus)"	8
8	"Sepals free or nearly so; petals when present never with a distinct claw"	9
8	"Sepals united; petals usually with a distinct claw"	15
9	"Capsule opening by as many teeth or valves (3, 4 or 5) as styles"	10
9	"Capsule opening by twice as many teeth or valves (6, 8 or 10) as styles"	12
10	"Plants short-stemmed with densely tufted or imbricate leaves; petals absent; capsule opening by short, blunt teeth"	Colobanthus
10	"Plants not as above; petals usually present, or if absent then capsule splitting deeply into valves"	11
11	"Styles usually 3; seeds subdiscoid to nautiloid"	"Minuartia {Minuartia mediterranea}"
11	"Styles 4–5; seeds obovoid to reniform or subglobose"	Sagina
12	"Styles 3; dehiscing capsule with 6 teeth or valves"	13
12	"Styles 4–5; dehiscing capsule with 8 or 10 teeth"	14
13	"Petals entire or almost so; capsule very shortly toothed"	Arenaria
13	"Petals bifid or absent; capsule deeply valved"	Stellaria
14	"Plant hairy; stamens 4, 5 or 10; petals absent or more or less bifid, rarely entire; mature capsule often curved"	Cerastium
14	"Plant glabrous; stamens 4, rarely 8; petals entire; capsule never curved"	"Moenchia {Moenchia erecta}"
15	"Calyx-tube with commissural veins alternating with midveins of lobes; styles 3–5"	16
15	"Calyx-tube without commissural veins; styles 2 (rarely 3)"	17
16	"Calyx-lobes equal to or longer than calyx tube; capsule-teeth as many as styles"	"Agrostemma {Agrostemma githago}"
16	"Calyx-lobes shorter than calyx tube; capsule-teeth usually twice as many as styles"	Silene
17	"Flowers with 2–6 epicalycine-scales; seeds dorsiventrally flattened, scutate"	18
17	"Flowers without epicalycine-scales; seeds laterally flattened to globose, not scutate"	19
18	"Bracts foliaceous; calyx-tube without scarious commissures"	"Dianthus {Dianthus armeria}"
18	"Bracts scarious or absent; calyx-tube with scarious commissures"	Petrorhagia
19	"Calyx-tube entirely herbaceous"	"Saponaria {Saponaria officinalis}"
19	"Calyx-tube with scarious commissures"	Gypsophila