270 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Acer glabrum tripartitum (Xutt.) Pax in Engler's Jahrb. 7: 218: 

 Acer tripartitwn Nutt. ; Torr. & Gray, Fl. X. Am. i : 247. 

 A form with trifoliolate leaves. 

 Montana : Mullen Pass, i860, Pcarsall. 



Acer grandidentatum Nutt. ; Torr. «fe Gray, Fl. N. Am. i : 247 

 [Man. R. M. 49; Syn. Fl. i^ : 440]. 

 Montana: XnttaU. 



Acer Negundo L. Sp. PL 1056 [Syn. Fl. i' : 440; 111. Fl. 2 : 400] ; 



Xegundo aceroides Moench, Meth. 334 [Man. R. M. 49]. 



The Box Elder grows throughout the plains and prairie regions, 

 mostly along the water courses, and reaches perhaps an altitude of 

 1500 m. 



Montana: Stillwater, 1889, Tzaecdy ; Helena, 1891, F. D. 

 Kelsey. 



RHAMNACEAE. 



Ceanothus sanguineus Pursh, Fl. Am. Sept. 167 [Man. R. M. 47 : 

 Syn. Fl. i' : 409] . 



Only found on the west side of the main range of the Rockies. 

 Montana: Columbia Falls, 1892, R. S. Williams, 873. 



Ceanothus velutinus Dougl. : Hook. Fl. Bor. Am. i : 125 [Man. R. 



M. 47; Syn. Fl. i' : 410; Bot. Cal. i: 102]. 



Rather common on hill sides, at an altitude of 1000-2500 m. 



Montana: Little Rocky Mts., 1889, Dr. V. Hazard; Bridger 

 Mountains, 1896, Flodman, 636; June 18, i^(^'] , Fydbo-gd- Bcsscy, 

 4323; Electric Peak, Aug. 18, 4322; Great Falls, 1886, F. TF. 

 Anderson, yi; Belt Mts., 1891, R. S. Williams, 33S ; Deer Lodge 

 Qo., Miss Emma Ware. 



Yellowstone Park: Soda Butte, 1885, Tzcccdy, 427. 



Rhamnus alnifolia L'Her. Sert. Ang. 5 [Man. R. ^L 46: Syn. 



Fl. i^ : 407 ; Bot. Cal. i : 100 ; 111. Fl. 2 : 406] . 



In swampy woods, up to an altitude of 2500 m. 



Montana: North Fork of Sun River, 1887, R. S. Williams; 

 Jocko Lake, 1880, Watson; Lo-Lo Creek, Watson. 



Yellowstone Park : East Fork of Yellowstone, 1885, Tzccedy, 

 428. 



