MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 207 



Watson, when reestablishing the genus Eriogynia in the Botanical 

 Gazette, divides it into three subgenera, which I regard as fully de- 

 serving the rank of genera. Eriogynia Hook, was based on 

 Saxifraga peciinata (Pursh) Hook. ; but as it is antedated by 

 Lutkea of Bongard, the species mentioned becomes Eiitkea fectiuata 

 (Pursh) Kuntze. As generic names for the other two species I 

 adopt here the subgeneric ones used by Watson. P. caespitosum 

 is a rather rare plant, growing on exposed rocks, at an altitude of 

 about 2000 m. 



Montana: Bridger Mts., June i8, 1897, Rydbcrg & Besscy, 

 4321; Gallatin Co., 1885, Peter Koch: 1886, Tzvccdy, 11/4; 

 Warm Spring Creek, Madison Co., 1887, Tzvcedy, 6; between Jef- 

 ferson and Madison Rivers, 1871, Hayden. 



*Kelseya uniflora (Wats.); Eriogynia unifora Wats. Bot. Gaz. 



15: 242. 



A cespitose woody plant of somewhat similar habit to the preced- 

 ing, but still more compact; it has smaller leaves, cfnd solitary sub- 

 sessile flowers at the ends of the short branches, which are densely 

 covered with the crowded leaves. It is named in honor of its dis- 

 coverer. Rev. F. D. Kelsey, and has only been found at the original 

 locality, so far as I know. 



Montana : Gates of the Mountains, 1888 and 1892, E. D. Kehey. 

 *Holodiscus ariaefolia (Smith) Greene, Man. Bay Reg. 113; 



Spiraea ariaefolia Smith ; Rees. Cycl. 33 : No. 16 ; Spiraea dis- 

 color ariaefolia Wats. Bot. Cal. i : 170. 



Resembles H. discolor, but has larger broadly ovate leaves, 5-10 

 cm. long, which are only slightly grayish (never white) tomentulose 

 beneath. It is generally a shrub a meter or two, sometimes 3-4 m., 

 high, while //. discolor scarcely reaches the height of a meter. It is 

 found in the western part of Montana. 



Montana: Columbia Falls, 1893,^. S. Williams, 874; Silver 

 Bow Co., Miss E. Hotchkiss; Missoula, 1898, Williams & Griffith. 

 Rubus parviflorus Nutt. Gen. i : 308 [111. Fl. 2 : 199] ; Rubtis Ntit- 



kamts Moc. ; DC. Prod. 2 : 566 [Torr. & Gray, Fl. N. Am. i : 450 ; 



Man. R. M. 79; Bot. Cal. i : 171]. 



Nuttall's name is a misnomer, as this species and R. odorahis 

 have the largest flowers of all the North American species. It is not 

 uncommon in open woods and on hillsides, at an altitude of 1000- 

 2500 m. 



