- 33 



16a. Leaves distinctly linear; cymes lateral; a common species 

 in marshes (2 5 dm. high; flowers white, early summer) 



Chickweed, Stellaria long-ifolia. 



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

 terminal 17. 



17a. Pedicels erect; clusters usually few-flowered; in extreme north- 

 ern part of the state only (1 -3 dm. high; flowers white, sum- 

 mer) Chickweed, Stellaria longipes. 



17b. Pedicels spreading; clusters open, many-flowered (2 6 dm. 

 high; flowers white, in summer) Chickweed, Stellaria graminea. 



18a. Petals distinctly longer than the sepals 19. 



18b. Petals as long as the sepals, or shorter than them 21. 



19a. Flowers much less than 1 cm. wide 



Mouse-ear Chickweed, Cerastium mitans. 



19b. Flowers more than 1 cm. wide 20. 



20a. Stem-leaves linear or narrowly lanceolate 



Mouse-ear Chickweed, Cerastium arvense. 

 20b. Stem-leaves oblong 



Mouse-ear Chickweed, Cerastium arvense var. oblongifolium. 



21a. Bracts green; pedicels short and inflorescence crowded 



Mouse-ear Chickweed, Cerastium viscosum. 



21b. Bracts with transparent white margins; pedicels longer than 

 the calyx and inflorescence open 



Mouse-ear Chickweed, Cerastium vulgatum. 



22a. Styles 5 23. 



22b. Styles 3 (310 dm. high; flowers in summer) 25. 



22c. Styles 2 29. 



23a. Calyx-teeth much longer than the calyx-tube (erect, 4 10 dm. 



high; flowers large, red, late summer) 



Corn Cockle, Agrostemma githago. 

 23b. Calyx-teeth shorter than the calyx-tube (4 10 dm. high; flowers 



in summer) 24. 



24a. Flowers crimson Mullein Pink, Lychnis coronaria. 



24b. Flowers white or pink White Campion, Lychnis alba. 



25a. Flowers night-blooming, always wilted during the day 



Catchfly, Silene noctiflora. 



25b. Flowers open during the day 26. 



26a. Flowers 6 mm. wide or less, white or pink 



Catchfly, Silene antirrhina. 



26b. Flowers 1 2 cm. wide, white to pink or purple - 27. 



26c. Flowers 2 cm. wide or more, crimson 



Fire Pink ; Silene yirginica. 



27a. Principal leaves in whorls of 4 Starry Campion, Silene stellata. 

 27b. Leaves opposite 28. 



