Petals entire (3 dm. high or less; flowers white, in summer)
(Stitchwort) --8.

7b. Petals notched or 2-cleft at the end, or none --11.

8a. Principal leaves 1 cm. long or less --9.

8b. Principal leaves 1.5 cm. long or more --10.

9a. Petals half as long as the sepals
=Stitchwort, Arenaria leptoclados.=

9b. Petals almost as long as the sepals
=Stitchwort, Arenaria serpyllifolia.=

10a. Leaves oblong-oval, obtuse. =Stitchwort, Arenaria lateriflora.=

10b. Leaves lanceolate, acute. =Stitchwort, Arenaria macrophylla.=

11a. Capsule splitting by valves at maturity; styles usually 3
(Chickweed) --12.

11b. Capsule opening by terminal teeth at maturity; styles usually 5
(tufted or matted plants, 1-5 dm. high; flowers white, in spring
and summer) (Mouse-ear Chickweed) --18.

12a. Petals distinctly shorter than the sepals, or none --13.

12b. Petals as long as the sepals, or longer --15.

13a. Leaves ovate (1-3 dm. high; flowers white, all summer)
=Chickweed, Stellaria media.=

13b. Leaves lanceolate to oblong (in water or wet places, 1-4 dm. high;
flowers white, in summer) --14.

14a. Flowers in a leafy terminal branching cluster
=Chickweed, Stellaria borealis.=

14b. Flowers in a lateral cluster with minute bracts
=Chickweed, Stellaria uliginosa.=

15a. Flowers in clusters with leaf-like bracts, or axillary and solitary
(in water or wet places; 1-3 dm. high; flowers white, summer)
=Chickweed, Stellaria crassifolia.=

15b. Flowers in clusters with scale-like bracts --16.

16a. Leaves distinctly linear; cymes lateral; a common species in
marshes (2-5 dm. high; flowers white, early summer)
=Chickweed, Stellaria longifolia.=

16b. Leaves distinctly broadest near the base; flower-cluster
terminal --17.

17a. Pedicels erect; clusters usually few-flowered; in extreme northern
part of the state only (1-3 dm. high; flowers white, summer)
=Chickweed, Stellaria longipes.=

17b. Pedicels spreading; clusters open, many-flowered (2-6 dm. high;
flowers white, in summer) =Chickweed, Stellaria grami