228 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



form was collected by me in the sand hills of Nebraska in 1893, no. 

 JS28. 



Montana: Great Falls, 1886, R. S. Willianis, ^ji. 



* Crataegus macracantha Lodd ; Loudon, Arb. Brit. Ed. 2, 2: 819 



[111. Fl. 2: 243]. 



Resembles C. coccinea, but has generally broader leaves, which 

 are subcordate at the base, and very large thorns 5-10 cm. long. 

 It belongs rather to the prairie region, but extends up in the moun- 

 tains to an altitude of 2000 m. 



Montana: Bozeman, 1886, P. Koch, 1188 and ii8g; 1886, 

 Tweedy; Park Co., 1887, Tweedy, 10; Great Falls, 1886, 7^. W. 

 Anderson, IJJ. 



*(? )Crataegus flabellata (Spach) ; Mesfihis fahcUata Spach, Hist. 



Veg. 2 : 63 ; Crataegus coccinea jlabellata Britton, Mem. Torr. 



Bot. Club, 5: 183 [111. Fl. 2: 242]. 



Nearest related to C. coccinea, but differs in the form and ser- 

 ration of the leaves, which are cuneate at the base, sharply incised 

 and thick and shining when old. One specimen that apparently be- 

 longs here has been collected in western Montana. 



Montana: Columbia Falls, 1892, R. S. Williams, 87"/. 



* Crataegus tomentosa L. Sp. PI. 476 [111. Fl. 2: 244]. 



Resembles C. niacracantJia and C. coccinea, but the leaves are 

 oval and more or less pubescent beneath. 



Montana: Dearborn River, 1883, Scribucr, ^g. 



Amelanchier alnifolia Xutt. Jour. Phila. Acad. Sci. 7: 22 [Man. 



R. M. 89; 111. Fl. 2: 239; Bot. Cal. i : 190] ; Aronia alnifolia 



Nutt. Gen. i : 306. 



The description of this species is somewhat vague in Coulter's 

 Manual probably owing to the fact that it covers the next two species 

 and perhaps also A. UtaJiense. Tlie leaves of A. alnifolia are 

 always thin, broadly elliptic or rounded, often subcordate at the 

 base and generally truncate at the apex, serrate only on the up- 

 per half, and glabrate or nearh' so. It is a shrub 2-5 m. high, grow- 

 ing in canons, up to an altitude of 2500 m. 



Montana: Helena, 1889,/^. D. Kelsey ; Spanish Basin, 1896, 

 Flodman, 545; Emigrant Gulch, Aug. 23, 1897, Rydberg & Besseyy 

 4432; Bridger Mts., June 1^,4431; Picnic Canon, Helena, 1892, 

 Brandegee ; Deer Lodge, Emma Ware. 



