MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 437 



sute and puberulent ; achenes pubescent. In dry valleys and on 

 hillsides, at an altitude of 2000-2500 m. 



Montana: Park Co., 1887, Tweedy, j2o; Little Belt Pass, 1896, 

 Flodnian, 8gi (type); Pony, July 7, 1897, Rydbcrg & Bessey, 

 S232 (depauperate form); Little BeltMts., 1883, Scribncr, 124.. 



Yellowstone Park: East Fork, 1885, Tzueedy, yjj. 



Tetradymia canescens DC. Prod. 6: 440 [Syn. Fl. i- : 379; Man. 



R. M. 204; Bot. Cal. i: 407]. 



Dry plains and hills, at an altitude of 1000-2000 m. 



Montana: Gardiner, 1885, T%vcedy, ys4^ Lima, i^g^,, Rydberg, 

 2847. 

 Tetradymia inermis Nutt. Trans. Am. Phil. Soc. (II.) 7: 415 ; Te- 



tradymia cancscois inermis Gray, Bot. Cal. i : 408 [Syn. Fl. 



i': 379; Man. R. M. 204]. 



Dry plains and hills, common, at an altitude of 1000-2000 m. 



Montana: Pass Creek, ^. Engleniann; Deer Lodge, i860, 

 Cooper; Helena, 1890, R. D. Kelsey ; Great Falls, 1891, R. S. 

 Williams, 84.1; Bozeman^ 1887, F. Tweedy, joi ; Forks of the 

 Madison, Juh' 26, 1897, Rydberg & Bessey, 52ig; Cliff Lake, July 

 27, s^-o; Fort Logan, 1883, Scribner, 118 ; Fort Ellis to the Yel- 

 lowstone, 1871, Ilayden Survey. 



Tetradymia spinosa Hook. & Arn. Bot. Beech. 360 [Syn. Fl. i^ : 

 379; Man. R. M. 204; Bot. Cal. i: 407]. 

 Rare in southern Montana, at an altitude of about 2000 m. 

 Montana : Big Hole River, Beaver Head Co., 1888, Tweedy, 22. 



Senecio megacephalus Nutt. Trans. Am. Phil. Soc. (II.) 7: 410 



[Syn. Fl. 1=^: 385; Man. R. M. 207]. 



Montana: Columbia Falls, 1892; R. S. Williams, gjS; Upper 

 Marias Pass and McDonald's Peak, 1883, Canby, igS. 



Senecio occidentalis (Gray) ; Senecio Rreniontii occidentalis Gray, 

 Bot. Cal. i: 618 [Syn. Fl. i- : 386; Man. R. M. 207]. 



Evidently a good species, growing among rocks, at an altitude of 

 2500-3000 m. 



Montana: Mill Creek, 1887, Tweedy, 338; Yogo, 1888, R. S. 



Williams, 787 ; Little Belt Mts., 1896, Flodman, giy ; Cedar Mts., 



July 16, 1897, Rydberg & Bessey, 323^; Lake Plateau, 1897, P. 



Koch, 24; Little Belt Mts., 1883, Scribner, 120; Upper Marias 



Pass, 1883, Canby, 201. 



