FLOWERING PLANTS AND FERNS OF ARIZONA 393 



2. Leaf blades elliptic or oblong-ovate, finely and usually bluntly toothed, 

 often somewhat narrowed to the obtuse or acutish apex. 1. |A. utahexsis. 



2. Leaf blades mostly suborbicular, coarsely and often sharply toothed, broadly 



rounded or truncate and often refuse at apex 2. A. bakeri. 



1. Styles normally 4 or 5; fruit at maturity dark plum purple, glaucous, more or 

 less juicy; leaf blades broadly oval, ovate, or suborbicular, broadly rounded 

 or truncate at apex, glabrate or loosely villous beneath (3). 



3. Top of the ovary and the calyx glabrous from the beginning, as is the whole 



plant; bark of the twigs dark reddish brown, becoming gray; leaf bl des 



coarsely serrate 3. A. polyc arpa. 



3. Top of the ovary and usually also the calyx persistently pubescent (4). 

 4. Leaf blades broadly crenate-dentate, often nearly to the base, cordate or 

 subcordate at base, 3 to 5 cm. long and about equally wide, usually 

 soon glabrate on both faces; bark of the twigs dark reddish brown, 



finally becoming gray 4. A. goldmanii. 



4. Leaf blades serrate-dentate, rounded, truncate, or short-cuneate (rarely 



subcordate) at base, persistently pubescent, at least on the lower 



surface (5). 



5. Hypanthium at anthesis commonly villous, often copiously so; calyx 



lobes pubescent on both faces; leaf blades seldom more than 2.5 



cm. long, becoming thickish, more or less persistently pubescent on 



both faces, grayish green above, the margin finely toothed, usually 



not to far below the middle; bark of the twigs soon becoming gray. 



5. A. OREOPHILA. 

 5. Hypanthium at anthesis glabrous or nearly so; calyx lobes commonly 

 glabrate externally; leaf blades mostly not less than 3 cm. long, 

 remaining thin, glabrate and bright green above, the margin coarsely 

 toothed, often nearly to the base; bark of the twigs more persistently 

 reddish brown 6. A. mormonica. 



1. Amelanchier utahensis Koehne, Gatt. Pomac. 25. 1890. 



Amelanchier rubescens Greene, Pittonia 4: 128. 1900. 



Apache County to Mohave County, 2,000 to 7,000 feet, dry rocky 

 slopes, common in and around the Grand Canyon, May. Colorado 

 to Nevada, New Mexico, and northern Arizona. 



Occasional specimens with the upper leaf surface glabrous or glab- 

 rate and somewhat shiny approach A. nitens Tidestrom. 



2. Amelanchier bakeri Greene, Pittonia 4: 128. 1900. 



Apache (?), Navajo, Coconino, and Gila Counties, 4,000 to 7,000 

 feet, April and May. Colorado, New Mexico, and Arizona. 

 Commonly about 2.5 m. (8 feet) high. 



3. Amelanchier polycarpa Greene, Pittonia 4: 127. 1900. 



North rim of the Grand Canyon (Eastwood and Howell 1047a, 7069). 

 Wyoming to New Mexico and northern Arizona. 



Other specimens from the Grand Canyon (Eastwood 6047, Eastwood 

 and Howell 948), having exceptionally small and shallowly dentate 

 leaves and small flowers, are referred doubtfully to this species. 



4. Amelanchier goldmanii Woot. and Standi., Contrib. U. S. Natl. 



Herbarium 16: 131. 1913. 



North rim of the Grand Canyon, San Francisco Peaks, and Flagstaff 

 (Coconino County), Lukachukai Mountains and Willow Spring ne ar 

 Fort Apache (Apache County), 7,000 to 8,000 feet, May and^June. 

 New Mexico and Arizona. 



It is doubtful that this and the two following are more than varieties 

 of A. alnifolia Nutt., a species widely distributed in western North 

 America. 



