150 MEMOIRS OF THE XEW YORK BOTANICAL GARDEN. 



Arenaria Nuttallii Pax, Engl. Jahrb. 18: 30 [Syn. Fl. i^ : 246]; 



Areiiaria pimgrns Nutt. ; Torr. & Gray, Fl. N. K. 1 : 179 [Man. 



M. 36 ; Bot. Cal. I : 69] : not Michx. 



Among rocks, at an altitude of 2500-3500 m. 



Montana: Bridger Mts., June 11 and 15, 1897, Rydbcrg ti- Bes- 

 sey, 40^^ and 4.046; Cedar Mountain, July 16, 404-/ ; East Boulder 

 Plateau, 1887, Tzveedy, 4^; Beaver Head Co., 1888, Tzucedv, 144; 

 Upper Marias Pass, 1883, Canby, 42 ; Bozeman, 1883, Scribncr, 12a. 



Yellowstone Park: Mt. Norris, 1885, Tzt'eedy, y68. 



Arenaria Sajanensis Willd. ; Schlecht. Mag. Ges. Nat. Fr. Berl. 7: 

 200 [Syn. Fl. i' : 246] ; Arenaria obtusa Torr. Ann. N. Y. Lye. 

 2: 170; A. bijlora var. obtusa Wats. Bibl. Ind. 95 [Man. R. M. 



Common on the tops of the mountains, among rocks and gravel, 

 at an altitude of 3000 m. or more. 



Montana: Little Belt Mts., iSgG, J^lodman, 444 ?ind 44 j ; Old 

 Hollowtop, Pony Mts., July 7 and 9, 1897, Rydberg & Bessey^ 

 40jg, 4040 and 40^2; East Boulder Plateau, 1887, Tweedy, 46; 

 Belt Mts., 1883, Scribner, 12: Cutbank Creek, 1S83, Canby, 4j. 



* Arenaria Sajanensis rigidula (Fenzl) Robinson, Proc. Am. Acad. 



29: 305 [Syn. Fl. i' : 247] ; Alsinc bifJora var. rigidula Fenzl; 



Ledeb. Fl. Ross i : 355. 



More tufted and flowering stems short ; leaves erect, firm and 

 closely imbricated. With the species. 



Montana: Spanish Peaks, 1896, Flodnian, 44J ', Yogo, 1888, 

 R. S. Williams, j^S: Lake Plateau, 1897, P. Koch: Old Hollow- 

 top, Jul}' 7, Rydberg & Besscy, 4041 ; Ft. Ellis to Yellowstone, 1871, 

 Hay den . 



Yellowstone Park : 1884, Tzucedy, 2SS ; Electric Peak, Aug. 

 18, 1897, Rvdberg & Bessey, 4044. 



Idaho: Mt. Chauvet, July 29, 1897, Rydberg ct- Besscy, 4043. 



Arenaria Sajanensis carnosula (Fenzl) Robinson, Proc. Am. Acad. 



29 : 305 ; Alsinc biflora carnosula Fenzl ; Ledebour, Fl. Ross. 



I : 355 ; Arenaria bijlora carnosula Wats. Bibl. Ind. 94 [Man. 



R. M. 36]. 



Montana: East Boulder Plateau, 1S87, Tn'ccdy, 4"/ ; Wisconsin 

 Creek, 1892, H. M, Fitch. 



Yellowstone Park: Hoodoo Peak, 1897, P. Koch, 7. 



