ROSACES 547 



first villose, becoming glabrous and rose-colored below the middle, and about ' in length; 

 leaves at the end of vigorous shoots often rhombic, coarsely serrate, often slightly incisely 

 lobed, coriaceous, 3' long, and 2' wide, with a stout broadly winged petiole. Flowers \' in 

 diameter, on long slender pedicels, in rather compact glabrous corymbs; calyx-tube broadly 

 obconic, glabrous, the lobes linear, entire or glandular with minute caducous glands, gla- 

 brous on the outer surface, sparingly villose on the inner surface, often tinged with red; 

 stamens 10-20; anthers pale rose color. Fruit ripening in September, on long pedicels, in 

 drooping few-fruited clusters, short-oblong, full and rounded at the ends, dark crimson 

 and marked by many large white dots when fully grown, becoming black and lustrous 

 at maturity, f |' long; calyx slightly enlarged, persistent, with elongated closely ap- 

 pressed entire lobes slightly villose and dark red on the upper side below the middle; flesh 

 thin, yellow; dry and mealy; nutlets 3-5, \' long, narrowed and rounded at the ends, 

 slightly ridged on the back, the ventral cavities broad and shallow. 



Fig. 503 



A tree, occasionally 20 high, with a slender trunk covered with dark brown scaly bark, 

 erect branches forming a narrow rather open head, and slender bright red-brown lustrous 

 branchlets marked by numerous pale lenticels, and unarmed or armed with straight 

 slender spines usually about 1' long. 



Distribution. Banks of mountain streams, often forming thickets; southeastern Idaho, 

 (Pocatello and Inkom, Bannock County); northeastern Nevada (Lee, Elk County) to 

 southwestern Wyoming, eastern Utah, southwestern Colorado, and northern New Mexico. 



XX. ANOMALY. 

 CONSPECTUS OF THE ARBORESCENT SPECIES. 



Stamens 5-15; corymbs glabrous; leaves scabrate above. 152. C. scabrida (A). 



Stamens 20; corymbs villose; leaves glabrous above. 153. C. virilis (A). 



152. Crataegus scabrida Sarg. 



Leaves oval to obovate, acuminate, gradually narrowed from near the middle to the 

 acuminate base, irregularly glandular-serrate nearly to the base, and divided above into 

 numerous short spreading lobes coated above when the flowers open at the end of May with 

 short pale hairs, and at maturity thick and firm, dark green and scabrate on the upper sur- 

 face, pale yellow-green and glabrous on the lower surface, 2'-3' long, and l^'-2' wide; 

 petioles slender, occasionally glandular, often slightly winged toward the apex, \'-\\' in 

 length. Flowers -f ' in diameter, on slender glabrous pedicels, in broad glabrous corymbs; 



