250 Rydberg : Studies on the 



^7^ (type in Herb. N. Y. Bot. Garden) ; Little Kate Basin, La 

 Plata Mts., §68 ; Cumberland Basin, 621. 



Cerastium Leibergii sp. nov. 



Perennial with a slender, branched rootstock : stems simple, 

 4-5 dm. high, sparingly villous and viscid-puberulent ; uppermost 

 internode of the stem about i dm. long : leaves few and scarcely 

 half as long as the internodes, linear-oblong, 2.5-3 cm. long, 6-7 

 mm. wide, the lower obtuse, the upper acutish, i -nerved, thin, 

 puberulent when young, ciliate on the margins : inflorescence vis- 

 cid-puberulent ; bracts lanceolate, 4-8 mm. long, not scarious- 

 margined ; pedicels in fruit 2.5-3 cm. long : sepals about 5 mm. 

 long, lanceolate, viscid-pubescent, scarious-tipped and margined : 

 petals scarcely twice as long as the sepals. 



This is perhaps most nearly related to the preceding, but differs 

 mainly in the broader, obtuse leaves and smaller flowers. It 

 grows in open Pinus ponderosa forests at an altitude of 970 m. 



Idaho : Upper St. Mary's River, 1895, /. B. Leiberg, iioj 

 (type in U. S. Nat. Herb.). 



Cerastium graminifolium sp. nov. 



Perennial with slender branched rootstock : stems 3-5 dm. 

 high, densely short-villous and somewhat viscid, erect ; upper- 

 most node of the stem below the inflorescence elongated, 5-10 

 cm. long: leaves linear-lanceolate, 2-3 cm. long, 3-5 mm. wide, 

 1 -nerved, short viscid-villous, mostly spreading: bracts lanceolate 

 or ovate-lanceolate : pedicels in fruit 2-4 cm. long : sepals nar- 

 rowly lanceolate, densely viscid-pubescent, only slightly scarious- 

 margined, acute, 5-6 mm. long: petals 12-14 mm. long, cleft 

 %-% their length into oblong, obtusish lobes : capsule almost 

 straight, about ^ longer than the sepals. 



This has gone under the name of C. arvensc, but differs from 

 the European plant, in the larger flowers, the more villous pubes- 

 cence and the more acute leaves, which resemble much those of 

 Alsinc graniinca. It grows in rich bottom lands. 



Washington : Pullman, 1897, Elmer, lyj (type in herb. N. Y. 

 Bot. Garden). 



Idaho: near Lewiston, 1896, A. A. & E. Gertrude Heller, 

 301 J ; Upper Ferry, Clearwater Ferry, 1892, Sandberg, Mac- 

 Dougal & Heller, ^g. 



