460 DECANDRIA. PENTAGYNIA, cerastium, 



terminal, in a loose dichotomous panicle ; fiediceh at length 

 elongated and deflexed. Leaflets of the calyx oblong, scari- 

 ous on the margin. Petals oblong, nearly as long again as the 

 calyx. Stamens \0. Styles 5, \cvy s\\ov\.; s^/^-mas glandular. 

 Cafisule three-times as long as the calyx, oblong-cylindric, in- 

 curved, 10-nerved, with 10 acuminate teeth at the summit. 

 Hab. On rocky hills and on mountains. Canada to Pennsylva= 

 nia. June. 



S. C oblongifolium*: cespitose, pubescent ; stems erect, 

 terete, even ; leaves lanceolate-oblons;, rather acute, shorter 

 than the joints ; flowers terminal, shorter than their pedicels; 

 petals obovate, bifid at the tip, twice the length of the calyx. 

 T orrey in Sill. Jour. IV. p. 63. C. bracteatum R af. 

 precis des decouv, p. 36 .'' 



JRoot perennial, creeping. Stems numerous from one root, about 

 8 inches high, simple, terete, not striate, retrorsely pubescent. 

 FLotvcrs terminal, few, in a dichotomous panicle ; fiedicels 

 erect, bracteate at the base. Leaflets of the caly:x: ovate-ob- 

 long, obtuse, scarious on the margin. Petals cleft about one- 

 third of the way down. Stamens 10 ; 5 of them a little longer. 



Hab. On mountains in Massachusetts. Dewey. June. 



This species is intermediate between the preceding and C. 

 arvense. From the former it diff"ers in being perennial, and 

 from the latter in its much broader leaves. It was first dis- 

 covered by Prof. Douglass, of West Point; near San- 

 dusky Bay, Lake Erie. 



7- C. tennifolium Ph, : pubescent, cespitose ; leaves 

 narrow- linear, longer than the internodes ; stems short, 3- 

 flowered at the summit ; petals obovate, emarginate, three 

 times as long as the calyx. Pursh Fl. I. p. 321. 



Root perennial, creeping. Stems numerous from one root, erectj 

 simple, terete, even, minutely pubescent. Leaves an inch or 

 more in length, and scarcely more than a line bread, a little 

 callous at the tip; the inferior subfasciculate. Flowers on 

 long peduncles, irenerally 3 from the summit of each stem. 

 Leaflets of the calyx obloi.g-lanceolate, acute. Petals slightly 

 cleft at the extren.ity. Stamens 10. Cafisule cylindrical, as 

 long as the calyx, 10-tootiied at the summit. 



Hab On mountains and rocky banks. New-England to Penn- 

 sylvania. June. 



This species is undoubtedly a native. It much resembles 

 C. arvense, but has longer and narrower leaves, and also 

 longer petals. 



308, AGROSTEMMA. L. 

 Calyx 1-leaved, tubulous, coriaceous, 5-cleft. Pe- 

 tals 5, unguiculate ; limb obtuse, undivided. Capsule 



