206 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Montana: Spanish Basin, iS<^6, I^lodmaii, jjp and 5^0, • Bridger 

 Mts., June 17, 1897, R\dbc)'i( d: Bessey, 4322; Gallatin Co., Mrs. 

 Aldcrson; Bear Creek, 1892, W, T. S/iaza ; Belt Mts., 1891, B. S. 

 Willianis, Jj6 : Sixteen I\Iile Creek, 1883, Scribncr, j6 ; Ross' 

 Hole, 1880, JVa/son. 



* Spiraea Douglasii Hook. Fl. Bor. Am. i : 172 [Bot. Cal. i : 169] . 



A species with rose-colored flowers and the lower surface of the 

 leaves white-tomentose. In wet places : found only in the extreme 

 western part of the state. 



Montana : Lo-Lo Creek, 1880, Watson. 

 Spiraea lucida Dougl. ; Hook. Fl. Bor. Am. i : 172 : Spiraea hctiilae- 

 folia Seringe ; DC. Prod. 2 : 544 [Torr. & Gray, Fl. X. Am. i : 



414; Man. R. M. 77 ; Bot. Cal. i : 169] ; not Pall. 



The true S. bctiilaefolta, as Prof. Greene has pointed out, is not 

 found in North America, unless in Alaska where a few doubtful 

 specimens have been collected. S. bciulacfolia is a Siberian plant 

 with much smaller thicker and rounder leaves than the American 

 plant. Coulter gives the color of the flowers as pale purple. 

 All I have seen, both in the field and in herbaria, have white flowers. 

 In Torrey and Graj-'s Flora they are so described. S. lucida is 

 common in woods throughout the mountain regions and ranges from 

 an altitude of 1000-2500 m. 



Montana: Spanish Basin, 1896, Flodnian, 341; Elk Mts., 342; 

 Jack Creek, July 15, 1897, Rxdbcrg & Bessey, 4323: Cedar Mts., 

 Julv 16, 4324; Electric Peak, Aug. 20, 4323; Helena, 1890, R. D. 

 Kelsey ; Silver Bow Co., Airs. JMoore: Bear Creek, 1892, W. T. 

 Shaxu ; Helena, 1894, E. Douglass; Spanish Creek, 1886, Tzvecdy, 

 iig3 ; Helena, 1891, K. D. Kelsev ; Belt Mts., 1890, R. S. Williams, 

 ijS; Smith River, 1883, Scribner, 34; Ross' Hole, 1880, JVatson. 



Yellowstone Park: 1886, Francis Hall: Mammoth Hot 

 Springs, 1884, Tzccedy, 102; Lower Falls, 1871, Hayden ; 1873, 

 C. C. Parry, pj. 

 Spiraea densiflora Nutt. : Torr. & Gray, Fl. N. Am. i : 414 : Spiraea 



betulaefolia rosea Coulter, Man. R. M. 77, in part. 



Montana: Bridger Mts., 1896, Flodnian, 343; Little Belt Mts., 



544- 



Petrophytoncaespitosutn (Nutt.) ; Spiraea caespitosa Nutt.: Torr. 

 & Gray, Fl. N. Am. i : 418 [Man. R. M. 77] ; Eriogynia caespi- 

 tosa Wats. Bot. Gaz. 15: 242. 



