192 MALACEAE. 



2. Amelanchier elliptica A. Nels. Hills from S. D. to Colo. Alt. 6000- 

 8000 ft. Cerro Summit; Crystal Creek; Beaver Creek. 



3. Amelanchier alnifolia Nutt. Dry hills and rolling plains from N. D. 

 and Mont, to Colo, and Utah. Alt 4000-8000 ft. Poverty Ridge, near Ci- 

 marron; Cerro Summit; Hounold; Glenwood Springs; Horsetooth Gulch; 

 Hounold; Central City; Four-Mile Hill; Parlin; Pallas; Pandora. 



4. Amelanchier oreophila A. Nelson. Hills of Wyo. and Colo. Alt. 5000- 

 8000 ft. Willow Creek; Camp Creek; Ojo; hills southeast of La Veta; 

 Van Boxle's ranch, above Cimarron; Los Pinos (Bayfield) ; Cottonwood 

 Lake; City Creek Canon; Minturn. 



5. Amelanchier Bakeri Greene. Dry hills of Colo. Alt. 6000-8000 ft. 

 Cedar Creek; Mancos; Los Pinos (Bayfield); Wolcott; Twin Lakes. 



6. Amelanchier prunifolia Greene. Dry hills and mountains of Colo, and 

 Utah. Alt. 4000-8000 ft. Mancos; Cerro Summit. 



7. Amelanchier rubescens Greene. Dry hills of Colo, and N. M. Between 

 Rifle and Meeker; Cedar Creek. 



2. PERAPHYLLUM Nutt. 



i. Peraphyllum ramosissimum Nutt. Dry hills and mountains from Ore. 

 to Colo, and Calif. Alt. 6500-8000 ft. Mancos; Los Pinos (Bayfield) ; Cerro 

 Summit; Cimarron; Durango; Dolores. 



3. CRATAEGUS L. HAWTHORN. 



Inflorescence pubescent ; leaves hairy beneath, at least on the veins. 



Leaf-blades orbicular or broadly obovate, abruptly contracted at the base, 5-7 

 cm. wide, less distinctly lobed, toothed to near the base. 



i. C. color adensis. 

 Leaf-blades obovate or rhombic, with a cuneate base, 5-9 lobed, with triangular 



acute lobes, 3-5 cm. wide. 2. C. occidentalis. 



Inflorescence glabrous ; leaves glabrous beneath. 



Leaf -blades serrate or incised; fruit 8-10 mm. broad. 



Leaf-blades rhombic, incisedly lobed with acute serrate lobes. 



3. C. cerronis. 

 Leaf-blades oblanceolate or rhombic-oblanceolate, merely irregularly serrate. 



4. C. Wheeleri. 

 Leaf -blades crenate ; fruit 6-7 mm. long. 5. C. saligna. 



1. Crataegus coloradensis Aven Nelson. Canons of Colo. Alt. 5000-6000 

 ft. Colorado Springs; Boulder. 



2. Crataegus occidentalis Britton. River-banks from N. D. and Mont, to 

 Neb. and Colo. Alt. 4000-6000 ft. Golden; foot-hills, Larimer Co.; Boulder; 

 Lower Boulder Canon ; Horsetooth Gulch. 



3. Crataegus cerronis A. Nels. Along streams in Colo. Alt. 5000-8000 ft. 

 Colorado Springs; Larin; Golden; Livermore; Boulder; Cerro Summit. 



4. Crataegus Wheeleri A. Nels. Along streams from Wyo. to Colo, and 

 Utah. Alt. about 6000 ft. Wolcott ; Steamboat Springs ; between Pallas and 

 Sydney; Steele Canon; Villa Grove; Dix; between Meeker and Craig; be- 

 tween Rifle and Meeker; Spring Creek, above Uncompahgre River. 



5. Crataegus saligna Greene. Hillsides of Colo. Alt. up to 7000 ft 

 Cimarron; Gypsum Creek Canon; Meeker; Wolcott; Gunnison; Parlin. 



