3a. Leaves opposite; flowers pink (about 1 dm. high; summer) 



Sand Spurrey, Sperg-ularia rubra. 



3b. Leaves whorled; flowers white (15 dm. high; leaves linear; 

 summer) Spnrrey, Spergula aryensis. 



4a. Leaves subulate or thread-like 5. 

 4b. Leaves linear to ovate 7. 



5a. Leaves opposite (1 dm. high or less; flowers white, summer) 



Pearlwort, Sagina procumbens. 



5b. Leaves fascicled in the axils 6. 



6a. Styles 4 or 5 (1 dm. high; terminal white flowers 5 mm. wide, 

 in summer) Pearlwort, Sagrina nodosa. 



6b. Styles 3 (1 4 dm. high; flowers white, nearly 1 cm. wide, 

 summer) Stitchwort, Arenaria stricta. 



7a. 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. 



lOa. Leaves oblong-oval, obtuse. Stitchwort, Arenaria lateriflora. 

 lOb. Leaves lanceolate, acute. Stitchwort, Arenaria macrophylla. 



lla. Capsule splitting by valves at maturity; styles usually 3 (Chick- 

 weed) 12. 



lib. 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 soli- 

 tary (in water or wet places; 1 3 dm. high; flowers white, 

 summer) Chickweed, Stellaria crassifolia. 



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



