MEMOIRS OF THE NEW YORK BOTANICAE GARDEN. 223 



No specimens from Montana have been seen by the author, but 

 the species is common in the Black Hills and northern Wyoming and 

 is probably to be found in the Little Missouri region of the state. 



Cercocarpus ledifolius Nutt. ; Torr. & Gray, Fl. N. Am. i : 427 



[Man. R. M. 80; Bot. Cal. i: 174]. 



On dr}^ hillsides and mountains, at an altitude of 2000-3000 ni. A 

 shrub, 2-5 m. high, with very hard wood. It is known as " Moun- 

 tain Mahogany." 



Montana: Madison Co., 1888, Tzvccdy, 77; Ennis, 1886, 11^2; 

 Helena, 1892, Kelscy, Madison River, 1883, Sc?-ib}ier, jyb. 



* Cercocarpus intricatus Wats. Proc. Am. Acad. 10 : 346. 



Like the preceding, but a low intricately branched shrub with 

 narrowly linear strongl}^ revolute leaves. It grows on dry hills, at 

 an altitude of about 2000 m. 



Montana: Melrose, 1895, Rydbcrg; 26gj. 



Dryas octopetala L. Sp. PI. 501 [Torr. & Gray, Fl. N. Am. i : 



420; Man. R. M. 81; 111. Fl. 2: 222]. 



An alpine plant, growing on the tops of the highest peaks, at an 

 altitude of over 3000 m. 



Montana: Old Hollowtop, Pony Mts., July 9, 1897, Rydberg & 

 Bessey, 44.18; East Boulder, 1887, Tzueedy, j ; Beaver Head Creek, 

 1888, g4; McDonald's Peak, 1883, Canby, gj. 



Yellowstone Park : Mt. Holmes, 1884, F. Tiucedy, p^. 



* Dryas Drummondii Richards. ; Hook. Bot. Mag. /. 2gy2 [Torr. & 



Gray, Fl. N. Am. i: 420; 111. Fl. 2: 223]. 



Resembles much the preceding species, but has yellow petals and 

 ovate sepals, which are densely black-hairy. At an altitude of 1200- 

 3000 m. 



Montana: Belt Mts., 1886, F. W. Anderson, iiy; Blackfoot 

 River and Flathead River, 1883, Canby, 26; Flathead River, 1861, 

 Lyall. 



Kunzia tridentata (Pursh) Spreng. ; Steud. Nom. i : 669 ; Tigarea 



tridentata Pursh, Fl. Am. Sept. 33 ; Piirshia tridentata DC. 



Trans. Linn. Soc. 12: 158 [Torr. & Gray, Fl. N. Am. i: 428; 



Man. R. M. 80; Bot. Cal. i: 173]. 



Grows on dry hills, at an altitude of 1500-2500 m. 



Montana: Willow Creek, Madison Co., July 14, 1897, Rydberg 

 & Bessey, <f4.ig; Deer Lodge, 1888, F. W. Traphagen ; Madison 



