CAKYOPHYLLACEAB (PINK FAMILY) 



185 



7. Cerasttum arvense L. Sp. PI. 438. 1753. Perennial, downy with re- 

 flexed hairs, caespitose: leaves linear to linear-lanceolate, clasping: cyme 

 few-flowered; pedicels erect or nodding: petals nearly twice longer than the 

 sepals: capsule Uttle exceeding the calyx, nearly straight. (C. effusum Greene, 

 Pitt. 4: 298. 1901.) — Colorado and northward through Utah, Montana, and 

 Wyoming, and across the continent. 



8. Cerastium oreophilum Greene,* Pitt. 4: 297. 1901. More or less 

 glandular-pubescent, with somewhat tufted stems; pubescence either minute 

 and strigose (deflexed upon the lower part of the stem) or spreading and 

 hispidulous, becoming minutely glandiuar or viscid above: leaves mostly 

 lance-linear, 1-3 cm. long, pubescent or glabrate, numerous below, sparser 

 and smaller upward: flowers Targe, 8-12 mm. broad, in strict or at length more 

 open cymes: petals twice as long as the sepals: capsule about twice as long as 

 the calyx. — Throughout oiu* range. 



7. SA6INA L. Pbarlwobt 



Low green herbs, with subulate or filiform glabrous leaves, and small 

 terminal usually long-pediceled flowers. Petals entire or wanting. Styles 

 alternate with the 4 or 5 sepals. : Capsule 4- or 5-valved. Seeds several to 

 many. 



1. Sagina saginoides (L.) Brit. Mem. Torr. Club 5: 151. 1894. A glabrous 

 tufted perennial, only a few cm. high: stems slender, decumbent: leaves 

 linear, mucronate, 5-15 mm. long: flowers 3-5 mm. broad, with 5 sepals, petals, 

 and styles: petals scarcely longer than the sepals: stamens 10: capsule ovoid- 

 oblong, twice as long as the obtuse sepals. S. Linnaei. — ^Moist spots and 

 banks in the mountains; New Mexico to arctic America. 



8. ARENARIA L. Sandwort 



Mostly low more or less tvifted or densely caespitose perennials, with ses- 

 sile usually subulate and more or less rigid leaves, and white cymosely pan- 

 icled or capitate flowers. The five sepals distinct or nearly so. Petals 5, 

 entire, not clawed. Stamens 10. Styles 3. Capsule globose, or short-oblong, 

 many-seeded. Seeds not appendaged at the hilum. — Includes Alsinopsis 

 Small. 



Valves of the capsule entire; plants low, tufted or caespitose. 

 Glandular-hirtellous throughout. 



Filiform stems 1—4 cm. long 1. A. aequicaulis. 



Slender stems 7-15 cm, long 2. A. Nuttallii. 



Leaves glabrous or nearly so. 



Sepals acute 3. A. macrantha. 



Sepals obtuse . . . .' 4.A. sajanensis. 



Valves of the capsule 2-cleft at summit. 

 Leaves oblong or elliptic, not pungent. 

 Leaves less than 1 cm. long . , .. . . .A. A.saxo3a. 

 Leaves more than 1 cm. long . . • . • • • Gb A. conf usa. 

 Leaves linear, more or less rigid and pungent. 

 Petals distinctly longer than the sepals. 

 Cyme congested, usually capitate . 

 Cyme open. 



Densely glandular-pubescent above 

 Nearly glabrous throughput 



Petals shorter than or merely equaling the (,_, 



Plants low, broadly and densely caespitoser cyme very dense ' . 10. A. Hookeri. 

 Plants tufted, usually 1-2 dm. high; cyme open . . . 11. A. Fendleri. 



1. Arenaria aec[uicaiilis A. Nels. Perennial from a very slender woody root, 

 glandular or viscid-pubescent throughout, only 3-6 cm. high: stems filiform, 



* A number of other segregates of C. arvense have been published. The writer finds him- 

 self unable to discern in them distinguishing characters. Students are referred to the original 

 descriptions as follows: C. Earlei Rydb. Bull. Torr. Bot. Club 30: 249. 1903; C. ecopviorum 

 Greene, Pitt. 4: ''S8; C. ocaidentale Greene, 1. o. 299. If *hese be distinct, then the above de- 

 ^criptir^n of C. "^ ivjihilwrn ij that of an aggregate. 



7. A. congesta. 



8. A. Tweedyi. 



9. A. uintahensis. 



