176 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Bcsscy, 414c} and 4130; Neihart, 1886, R. S. Wil/ianis, j68 ; West 

 Gallatin, 1883, Scribncr^ Sd. 



Yellowstone Park : East De Lacy's Creek, Aug. 10, 1897, 

 Rydbcrg & Bcsscy, 41 ji. 



* Roripa Nuttallii (Wats.) ; Xastiirtiuvi cufvisilicpia Nuttallii 



Wats.; Gray, Syn. Fl. i' : 148, except the synonym, IV. poly- 



morfhiim Nutt. 



It is much taller and simpler than R. curvisiliqua, with larger 

 flower and thicker less curved pods. 



Montana: Old Hollowtop, Pony Mts., July 9, 1897, Rydberg & 

 Bcsscy, 4154. 



* Roripa lyrata (Nutt.) ; Nasturtium Ivratum Nutt. ; Torr. «& Gray, 



Fl. N. A. I : 73 ; uVasturtium curvisiliqiia lyratuni Wats. Bot. Cal. 



i: 43. 



This was included in R. curvisiliqiia by Watson, but is as distinct 



as any of the species. It is very low and spreading, with lyrately 



deeply divided leaves having broad lobes, and a shorter thicker almost 



straight pod, which is generally narrowed upward and tipped 



with a very short style ; it is evidently nearer related to R. obtusa 



than to R. curvisiliqiia. It grows on sand bars and gravelly shores, 



at an altitude of 2000-2500 m. 



Montana: Helena, 1882, Tweedy. 



Yellowstone Park: Shoshone Lake, Aug. 10, 1897, Rydberg 

 & Bcssey, 4132, 4153; Swan Lake, 1885, Tzveedy, 361 ; 1873, C. C. 

 Parry, 26. 

 Roripa obtusa (Nutt.) Britton, Mem. Torr. Bot. Club, 5: 169 [111. 



Fl. 2: 124] ; Nasturtium obtusion Nutt. ; Torr. & Gray, Fl. N. 



A. I : 74 [Syn. Fl. i' : 148; Man. R. M. 24; Bot. Cal. 2: 431]. 



Rare ; in wet soil. 



Montana: Lima, 1895, Rydbcrg; 26^3: Bozeman, 1891, W. T. 

 S-liazv. 

 Roripa alpina (Wats. ) : Nasturtium obtusum var. ( ?) alpinum Wats. 



Bot. King's Exp. 5: 15 [Syn. Fl. i' : 148; Man. R. M. 24]. 



The original specimens were alpine and dwarfed and do not give 

 a good idea of the plant, which is often 2-3 dm. high. The short 

 oblong ovate pod on a rather elongated pedicel and the upright and 

 simple stem place it nearer to R. paliistris and R. hispida, from 

 both of which it is distinguished by the less deeply divided leaves. In 

 wet places on mountains and hillsides, at an altitude of 2000-3000 m. 



