MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 237 



Trifolium nanum Torr. Ann. Lye. N. Y. i : 35 [Man. R. M. 55]. 

 On the summits of the highest peaks, at an altitude of 2700-3300 m. 

 Montana : Indian Creek, July 22, 1897, Rydbcrg & Bessey, 446J. 



Trifolium dasyphyllum Torr. & Gray, Fl. N. Am. i : 315 [Man. 



R. M. 55]. 



On the tops of the highest peaks, rather rare. Altitude 2500-3000 m. 



Montana: Deep Creek, 1887, Tweedy, 115; Old Hollowtop^ 

 near Pony, July 7 and 9, 1897, Rydberg & Bessey, 4455 and 4456. 



Lotus Americanus (Nutt.) Bisch. Linnaea, 14; Litt. 132 [111. Fl. 

 2: 280]; TrigoncUa Americana Nutt. Gen. 2: 120; Hosackia 

 Purshiana Benth. Bot. Reg. //. 12^7 [Man. R. M. 56; Bot. 

 Cal. i: 137]. 



In sandy soil, up to an altitude of 1500 m. 

 Montana: Livingston, 1887, Tweedy, 112. 



Psoralea lanceolata Pursh, Fl. Am. Sept. 475 [Man. R. M. 57 ; 

 Bot. Cal. i: 140; 111. Fl. 2: 281]. 

 Montana: Glendive, 1883, L. F. Ward; Coues. 

 Yellowstone Park : 1888, Dr. Chas. H. Hall. 



Psoralea tenuiflora Pursh, Fl. Am. Sept. 475 [Man. R. M. 56; 



111. Fl. 2: 281]. 



Dry plains and hills, up to an altitude of 1500 m. 



Montana: Great Falls, 1886, F. W. Anderson, 84; 1891, R. S. 

 Williams, go; Livingston, 1887, Tzveedy, 122; Horned Creek,. 

 1883, Scribner, 2j; Billings, 1898, Williams & Griffith. 



Psoralea argophylla Pursh, Fl. Am. Sept. 475 [Man. R. M. 57 \ 



111. Fl. 2: 283]. 



Dry prairies and plains, up to an altitude of 1500 m. 



Montana: Warmsprings, R. S. Williams, 441; Custer Co.,. 

 Mrs. Light. 



Psoralea esculenta Pursh, Fl. Am. Sept. 475 [Man. R. M. 57 ; 111. 



Fl. 2: 284]. 



Plains and hills, up to an altitude of 1500 m. 



Montana: Great Falls, 1887, F. W. Anderson; 1891, R. S, 

 Williams, 95. 



* Petalostemon oligophyllum (Torr.); Petalostemon gracile oligo- 

 ■phyllnm Torr. Emory's Mil. Rec. 139; Knhnistera oligochylia 

 Heller, Bull. Torr. Bot. Club, 23: 122 [111. Fl. 2: 290]. 



