MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 269 



what rhomboid, rather thick, bright green, strongly veined beneath, 

 glabrous except the veins on the lower surface, with wavy or sinu- 

 ately toothed margins ; flowers in small conical axillary panicles, 

 which are much shorter than the petioles, their branches short ; 

 flowers yellow; petals about 3 mm. long, ovate, whitish yellow with 

 greenish streaks; fruit when ripe white and shining,' a little de- 

 pressed-globular, 5-6 mm. in diameter. 



It has been invariably mistaken for R. Toxicodendron, which has 

 pubescent sinuatelv lobed leaflets, and is confined to the southeastern 

 United States. From R. radicans ( R. Toxicodendron var. radicans), 

 it differs in never being a climber, but always an erect shrub, in the 

 thicker, somewhat glaucous leaves, the smaller and denser panicles, 

 and the larger flowers and fruit. Both grow together in Nebraska,^ 

 and they always remain distinct. The present species occurs on hill- 

 sides and in open woods, from Kansas to Arizona and British Colum- 

 bia. 



Montana: Great Falls, 1885, R. S. Williams, 2gi ; northern 

 Montana, F. W. Anderson. 



CELASTRACEAE. 



Pachystima Myrsinites (Pursh) Raf. Am. Monthly Mag. 2: 176 



[Man. R. M. 46; Bot. Cal. i : 99 ; Syn. Fl. i' : 398]; Ilex ? 



Myrsinites Pursh, Fl. Am. Sept. 119. 



In woods, up to an altitude of 2500 m. 



Montana: Virginia City, 1886, Tweedy, io8g; Columbia Falls,. 

 1892, R. S. Williams, 8y2 ; Missoula, 1880, Watson. 



ACERACEAE. 



Acer glabrum Torr. Ann. Lye. N. Y. 2: 172 [Man. R. M. 49;. 



Syn. Fl. i^: 436; 111. Fl. 2: 399; Bot. Cal. i: 107]. 



In damp woods and along streams, ascending to an altitude of 

 2500 m. 



Montana: Deer Lodge, 1888, 7^. W. Traphagen; Bridger Moun- 

 tains, June 12, 1897, Rydberg & Bessey, 4521 ; Bear Gulch, 1887, 

 F. Tzveedy, 171; Belt Mts., 1891, R. S. Williams, 616; Deer 

 hodge Co., Miss Fmma Ware; Bridger Canon, 1892, W. T.Shaw; 

 Missoula, 1898, Williams & Griffith. 



Yellowstone Park: Mammoth Hot Springs, 1884, Tweedy,. 

 281. 



