MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 227 



Co., 1888, Tweedy, pj ; Lewis and Clarke Co., Mrs. Miith; Gal- 

 latin Co., Mrs. Alderson; Swimming Women Creek, 1883, Canby ; 

 Missoula, 1898, Williams & Griffith. 



Yellowstone Park: 1888, Dr. C. H. Hall; Tower Falls, 

 1885, Tweedy, ^75. 



POMACEAE. 



Sorbus sambucifolia (Cham. & Schlecht.) Roem. Fam. Nat. Syn. 



3: 39 [111. Fl. 2: 233] ; Pyriis sambucifolia Cham. & Schlecht. 



Linnaea, 2 : 36 [Torr. & Gray, Fl. N. Am. i : 472 ; Man. R. 



M. 89; Bot. Cal. i: 189]. 



In canons and on hillsides in the mountain regions, at an altitude 

 of 1000-2500 m. 



Montana: Bridger Mts., 1896, Flodnian, ^^6 ; June 14 and 18, 

 id>(^^ , Rydberg d- Bessey, ^^2j and 4428; Neihart, 1891, 7?. S. 

 Williams, 8ji ; Bozeman, 1892, W. T. Shaw; Torn Miner Creek, 

 1887, Tzveedy, 4; Prickly Pear Creek, 1883, Scribner, ^ga. 



Crataegus rivularis Nutt. ; Torr. & Gray, Fl. N. Am. i : 464 [Man. 



R. M. 88; Bot. Cal. i: 189]. 



A rather rare plant growing in canons, at an altitude of 1500— 

 2500 m. 



Montana: Priest's Pass, 1892, R. D. Kelsey (small-leaved 

 form) ; Flathead River, 1883, Canby, no. 



Crataegus brevispina Dougl. ; Steud. Xom. Ed. 2, i : 432 ; Cra- 

 taegus punctata (i brevispina Dougl. in Hook. Fl. Bor. Am. i : 

 201 ; Crataegus Dougiasii Lindl. Bot. Reg. /. 1810 [Man. R. 

 M. 88; Bot. Cal. i: 189]. 



The most common of' the hawthorns in Montana, growing on river 

 banks, in canons, etc., at an altitude of 1000-2500 m. 



Montana: .Bozeman, 1886, F. Tweedy, iigo and iigi ; Galla- 

 tin Co., Mrs. Alderson; Bozeman Canon, 1892, W. T. Shaiu ; 

 Lewis and Clarke Co., Mrs. E. Muth; Deep Creek, 1890, R. S. 

 Williams, _yj2 ; Bozeman, 1883, Canby, log. 



(? )Crataegus coccinea L. Sp. PI. 476 [Torr. & Gray, Fl. N. Am. i : 



465 ; Man. R. M. 89; 111. Fl. 2: 242]. 



In the specimens seen from Montana the leaves have less pointed 

 teeth and are more puberulent, and the fruit is smaller than in the 

 eastern tree. It may be a distinct species. Apparently the same 



