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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. 
1. 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. 
1. C. coloradensis. 
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 Fallas 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. 
