394 MISC. PUBLICATION 423, U. S. DEPT. OF AGRICULTURE 



5. Amelanchier oreophila A. Nels., Bot. Gaz. 40: 65. 1905. 

 Apache, Navajo, Coconino, Gila, and Yavapai Counties, 4,000 to 



7,000 feet, April and May. Montana to New Mexico, Arizona, and 

 Nevada. 



In the absence of mature fruit, this species is likely to be confused 

 with A. bakeri, but the latter has usually more coarsely toothed leaf 

 blades. 



6. Amelanchier mormonica C. K. Schneid., Repert. Spec. Novarum 



Regni Veg. 3: 182. 1906. 



Apache, Navajo, Coconino, and Gila Counties, 6,300 to 9,500 feet, 

 May and June, also Sycamore Canyon near Ruby, Santa Cruz County, 

 about 4,000 feet (Goodding 6488), type from Mormon Lake, Coconino 

 County (MacDougal 102). Wyoming to New Mexico and Arizona. 



This shrub attains a height of at least 3.6 m. (12 feet). The species 

 seems to be intermediate between A. goldmanii and A. oreophila. 



Peraphyllum ramosissimum Nutt., the so-called squaw-apple, is to be sought 

 in northern Arizona. It is closely related to Amelanchier but has the flowers 

 solitary or 2 or 3 in a cluster, petals pink, and leaf blades narrowly oblanceolate. 



8. CRATAEGUS. Hawthorn 



Shrubs or small trees, armed with strong sharp thorns; leaves 

 simple, petioled, serrate to shallowly lobed, strongly veined, sparsely 

 pubescent beneath or glabrate; flowers in several-flowered corymbs; 

 petals rather small, round, usually white; fruits nearly globose, thin- 

 fleshed, nearly filled by the large bony seeds. 



Key to the species 



1. Spines few, not more than 2.5 cm. long; leaf blades elliptic, about twice as long 

 as wide, not or scarcely lobed, tapering at base 1. C. rivularis. 



1. Spines numerous, 3 to 5 cm. long; leaf blades ovate, less than twice as long as 

 wide, often distinctly lobed, rather abruptly contracted at base. 



2. C. ERYTHROPODA. 



1. Crataegus rivularis Nutt. ex Torr. and Gray, Fl. North Amer. 1: 



464. 1840. 

 Clear Creek Canyon southeast of Winslow, Navajo County, about 

 5,000 feet (Vaughn and Benham 6463), Wyoming and Idaho, south 

 to New Mexico and northern Arizona. 



2. Crataegus erythropoda Ashe, N. C. Agr. Expt. Sta. Bui. 175: 113. 



1900. 



Bonito Creek, White Mountains, Apache County (Goldman 2495), 

 Oak Creek Canyon, Coconino County (Pearson 445, Goldman 2184), 

 5,400 to 6,000 feet, along streams in canyons. Wyoming to New 

 Mexico and Arizona. 



The specimens from Oak Creek Canyon approach C. wootoniana 

 Eggleston in their rather deeply lobed leaves. 



9. RUBUS 



Plants shrubby, of diverse habit and appearance, often prickly; 

 leaves simple or pinnate; flowers in few-flowered racemes or corymbs, 

 sometimes solitary, the petals white or tinged with pink; stamens 

 numerous; pistils several or numerous, on a convex receptacle, becom- 

 ing 1 -seeded drupelets aggregated in a more or less fleshy fruit. 



