MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 1 87 



*Arabis Columbiana Macoun, Cat. Can. PI. 2: 304. 



Resembles a small form of the preceding, but the pods are 

 divergent, not reflexed, and somewhat curved. A mountain plant, 

 growing at an altitude of 2000-3000 m. 



Montana : Spanish Peaks, 1895, Flodnian, joo; Old Hollowtop, 

 Pony Mts., July 7-9, 1897, Rydbcrg & Bcssey, 4.2 1^ and 4216; 

 Cedar Mt., July 16, ^^/7,- Spanish Basin, June 2^,4214.; Bridger 

 Mts., June 15, 421J. 



Yellowstone Park: Slough Creek, 1885, Tweedy, S54- 



Arabis canescens Nutt. ; Torr. & Gray, Fl. N. Am. i : 83 [Syn. Fl. 



i^ 165; Man. R. M. 20; Bot. Cal. 2: 431]. 



Coulter describes this species as having linear-oblanceolate to 

 broadly spatulate leaves and more or less spreading or reflexed pods 

 on short pedicels. The type specimens, collected in the Rocky 

 Mountains (the locality is not given and it may have been in Wyo- 

 ming, Montana or Idaho), some collected by Prof. Aven Nelson in 

 Wyoming and the following from Montana, have almost linear leaves 

 and strongly reflexed narrow pods. The stems are several, from a 

 perennial base, slender and very strict. All other specimens so de- 

 termined seen by me belong to the following, or to A. Leninionu. 

 Grows on dry hills, at an altitude of 2000-3000 m. 



Montana: Melrose, 1895, Rydbcrg, 26JJ ; Lima, 26J4; Elk 

 Mts., 1896, Flodnian, j02; Bridger Mts., June 14, 1897, Rydberg 

 & Bessey, 422^. 



Yellowstone Park: Stinking Water, 1873, Parry, ^o. 



*Arabis puberula Nutt. ; Torr. & Gray, Fl. N. Am. i : 82. 



Like the last, but taller and simpler and with oblanceolate leaves, 

 the cauline ones auricled. It is rare in Montana. The specimens 

 collected by Howell and Suksdorf, and cited under A. canescens in 

 the Synoptical Flora, belong here. 



Montana: Bozeman, 1892, W. T. Shazu. 



Yellowstone Park: Slough Creek, 1885, Tzveedy, S54- 



Arabis Lemmonii Wats. Proc. Am. Acad. 22: 467 [Sjm. Fl. i^ : 

 166] : Arabis canescens latifolia Wats. King's Exp. 5: 17. 

 Resembles the two preceding in the flowers and pubescence ; 

 but the stems are ascending with few cauline leaves, the basal leaves 

 broadly spatulate and the p6ds spreading and much broader. On 

 the higher mountains, at an altitude of about 3000 m. 



