MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 423 



Chaenactis Douglasii H. & A. Bot. Beech. 354 [Syn. Fl. i^ : 341; 



Bot. Cal. I : 391 ; Man. R. M. 194]. 



On hillsides and in sand-draws and dried up river beds, at an alti- 

 tude of 1000-2500 m. 



Montana: lVye//i; Little Blackfoot River, i860, Cooper; Mad- 

 ison Co., Hfrs. Flora McJVultv ; Lower Falls of Missouri, 1886, 

 R. S. Williams, 81 ; Spanish Basin, 1896, Flodman, 8y^; Mussel- 

 shell River, 8jj; Garrison, 1895, Rydbcrg, 2pjp; Melrose, 2g^o; 

 Indian Creek, July 21, 1897, Rydberg & Bessey, 5183; Spanish 

 Basin, June 23, 5/^^; Madison Valleys 187 1, Hay den Survey ; Six- 

 teen Mile Creek, 1883, Scribner, 112. 



Yellowstone Park : 1888, Dr. C/ias. II. Hall ; Mammoth 

 Hot Springs, 1884, Tvjecdy, i6y ; 1883, Dr. J. S. Neiuberry . 

 * Chaenactis achillaefolia Hook. & Arn. Bot. Beech. 354. 



Low^er than the preceding, seldom more than i dm. high, densely 

 white-tomentose, and with crowded leaves. It grows in alkaline soil, 

 especially in the hot-spring formations, at an altitude of about 2500 m. 



Yellowstone Park: 1883, Miss Mary Conifton; Biscuit 

 Basin, Aug. 5, 1897, Rydberg & Bessey, SiSj ; Lower Geyser 

 Basin, Aug. 4, ^188. 



Chaenactis alpina (Gray) Jones, Proc. Cal. Acad. (II.) 5: 699; 

 Chaenactis Douolasii alpina Gray, Syn. Fl. i' : 341 [Man. R. 



M. 195]. 



On the tops of the higher mountains, at an altitude of nearly 

 3000 m. 



Montana: Cedar Mountain, July 16, 1897, Rydberg & Bessey, 

 518s; Indian Creek, July 22, 5186; Lake Plateau, 1897, P. Koch, 

 2y and ^o. 



Bahia oppositifolia Nutt. ; Torr. & Gray, Fl. N. Am. 2 : 376 [111. Fl. 



3: 448; Syn. Fl. i^: 332; Man. k. M. 192]; Trichophyllmn 



opfositifoliiun^MXX. Gen. 2: 167. 



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



Montana: Livingston, 1887, 7^. Tweedy, 380; Great Falls, 1885, 

 F. W. Anderson, 240; 1891, R. S. Williams, ^6; Custer Co., 

 1892, Mrs. Light; Sun River Crossing, 1883, Scribner, iii. 



*Hulsea carnosa. 

 Very fleshy ; stems from creeping rootstocks and a deep thick root, 

 in big clumps, 1.5-3 dm. high, very leafy throughout, pubescent, 



