138 FLOBA OF PHILADELPHIA. 



*"*Calyx of distinct sepals, or the sepals united only at the base. 

 Fruit a capsule, dehiscent by apical teeth or valves. 

 Styles separate to the base; stipules wanting. 



Plants not fleshy; disk of the flower inconspicuous or none. 

 Petals deeply 2-cleft or 2 -parted (rarely none). 

 Capsule ovoid or oblong, dehiscent by valves. 



7. Alsine. 

 Capsule cylindric, commonly curved, dehiscent by 

 teeth. 8. Cerastium. 



Petals entire or emarginate (rarely none). 



Capsule cylindric. 9. Holosteum. 



Capsule ovoid or oblong. 



Styles as many as the sepals. 10. Sagina. 

 Styles fewer than the sepals. 



Seeds not appendaged by a strophiole. 



11. Arenaria. 

 Seeds strophiolate. 12. Moehringia. 



Plants fleshy, maritime, disk conspicuous, 8-10-lobed. 



13. Ammodenia, 

 Styles separate to the base; stipules scarious. 



Styles and capsule-valves 5. 14. Spergula. 



Styles and capsule-valves 3. 15. Tissa. 



Fruit an indehiscent or irregularly-bursting utricle or achene. 

 Leaves stipulate. 



Sepals awn-tipped. 16. Paronychia. 



Sepals awnless. 17. Anychia. 



Leaves not stipulate. 18. Sclerantlius. 



1. AGEOSTEMMA L. 



1. Agrostemma Githago L. Corn Coclie. M. p. 388. In grain fields and 

 waste places. Summer. 



2. SILENE L. Catchfly, Campion. 



Leaves, or some Of them, verticillate in 4 's. 1. 8. stellatu. 



Leaves all opposite. 



Calyx much inflated and bladdery. 



Flowers few, leafy-bracted. 2. S. alba. 



Flowers numerous, in leafless cymes. 3. S. viUgari.t. 



Calyx merely expanded by the ripening pod. 

 Flowers cymose or paniculate. 



Day-blooming, flowers rarely white, mostly pink or red. 

 Perennials, more or less viscid-pubescent. 



Petals 2-cleft, 2-lobed, or irregularly incised, scarlet 



or crimson. 4. S. Virginica. 



Petals erose, entire or emarginate, pink. 



5. S. Caroliniana. 

 Annuals, glutinous at or below the nodes. 



Calyx ovoid. 6. S. anlirrliina. 



Calyx club-shaped; flowers large, cymose. 



7. S. Armcria. 

 Night-blooming, flowers large, white. 8, S. noctiflora. 



Flowers spicate or racemose, short-pedicelled. 



Spike-like raceme simple; flowers small. 9. S. Anglica. 



Raceme forked; flowers 12-16 mm. broad. 10. S. dicliotoma. 



1. SiLENE STELLATA (L.) Ait. Starry Campion. M. p. 389. Woods. 



Summer. 



2. SiLENE ALBA Muhl. M. p. 389. Shaded or moist places. Summer. 



Lancaster — Peach Bottom (Ca.) (Pr.), York Furnace (Cr.) (Le.), 

 mouth of Tucquan Creek (St.), Safe Harbor (W. Tr.). 



