MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. l8l 



On alpine peaks among rocks, at an altitude of about 3000 m. 



Montana: Mt. Chauvet, July 29, iSc)'],Rydhcro-ci'Besscy,4i8j; 

 Boulder Creek, 1887, Tzveedy, j6; Lone Mountain, 1886, Tweedy, 

 1083. 



* Draba lonchocarpa ; Draha nivalis el on gat a Wats. Proc. Am. 



Acad. 23 : 258. 1886 [Syn. Fl. i' : 100] ; not D. eloiigafa Host, 



1827. 



Like the last, but with narrowly linear pods 8-15 mm. long. 



Montana: McDonald's Peak and Upper Marias Pass, 1883, 

 Canby, 26 and 2j ; Cedar Mt., July 16, 1897, Rydberg d- Bessey, 

 4.188; Boulder Creek, 1887, Tzveedy, 26. 

 Draba glacialis Adams, Mem. Soc. Nat. Mosc. 5: 106 [Syn. Fl. 



i^ : 112] ; Draba alpina glacialis Dickie, Journ. Linn. Soc. il : 



33 [Man. R. M. 17 ; Bot. Cal. i : 29]. 



In this species Watson included at least four different plants, this 

 and the three following. D. glacialis has an oblong acute pod 

 which is considerably pubescent, and elongated oblong rather thin 

 leaves, which much resemble those of D. alpina, but are longer, 

 narrower, and with a distinct keel. 



It is an alpine plant, growing at an altitude of about 3000 m. 



Montana: Upper Marias Pass, 1883, Canby, 28 ^n(^2g; Madison 

 Co., 1888,7^. Tweedy, 114; Park Co., 1887,^5,- Lake Plateau, 1897, 

 P. Koch, 41 and 60 ; Cedar Mt., July 16, 1897, Rydberg & Bessey, 

 4186 ; Old Hollowtop, 4174a and 418 j. 



Yellowstone Park: Mt. Washburn, 1885, Tzveedy, 366. 



* Draba densifolia Nutt. ; Torr. & Gray, Fl. N. Am. i : 104 ; Draba 

 glacialis pectinata Wats. Proc. Am. Acad. 23: 260 [Syn. Fl. 

 I^ : 112]. 



Differs from the preceding in the thicker shorter crowded leaves 

 and flatter pod, which has somewhat longer pubescence. It grows 

 in localities similar to those of the preceding, but is more common. 



Montana: Little Belt Mts., 1896, Flodnian, 4Qg ; Silver Bow, 

 1895, Rydberg, 266g; Bridger Mts., June 15, 1897, Rydberg d- 

 Bessey, 4173; Old Hollowtop, Pony, July 9, 4174; Upper Marias 

 Pass, 1883, Canby, 28; Madison Co., 1888, Tzueedy, 113. 



Yellowstone Park : 1884, Tzveedy, 204. 



* Draba oligospeima Hook. Fl. Bor. Am. i : 51. 



Differs from the two preceding in the short nearly orbicular pod, 

 which is finely puberulent or glabrate, and usually in the much 



