446 



TREES OF NORTH AMERICA 



with the opening of the flowers; calyx-tube narrowly obconic, sparingly villose, the 

 lobes elongated, narrow, acuminate, tipped with minute red glands, finely glandular- 

 serrate, glabrous on the outer, pubescent on the inner surface ; stamens 10-20, usually 

 10; anthers pinkish purple; styles 4 or 5, surrounded at the base by tufts of pale 

 hairs. Fruit ripening from the 15th to the 20th of September, and usually falling 

 about the 1st of October, on short glabrous pedicels, in drooping few-fruited clusters, 

 short-oblong to slightly obovate, dull red to crimson, ' |' long, about \' wide; 

 calyx sessile, with spreading closely appressed serrate usually persistent lobes; flesh 

 thin, pale yellow or nearly white, acidulous; nutlets 4 or 5, broad, narrowed and 

 acute at the ends, prominently ridged on the back, with a high narrow ridge, or often 

 grooved, about J-' long. 



A tree, sometimes 25 high, with a trunk 2'-6' in diameter and often 6-9 long ? 

 covered with close dark gray bark, ascending branches forming an oblong, open 

 head, and slender branchlets light orange-yellow and covered when they first appear 

 with long scattered caducous white hairs, becoming bright red-brown and lustrous, 

 and dark gray-brown the following year, and armed with many stout usually slightly 

 curved bright red shining spines, I'-l^' long. 



Distribution. River banks and low woods in rich soil; northeastern Illinois, 

 Leyden township, Lagrange, and Thatcher's Park, near Chicago. 



***Stamens usually 10, 



78. Crataegus Pringlei, Sarg. 



Leaves oval; acute, rounded or often abruptly narrowed and cuneate at the base, 

 occasionally irregularly lobed above the middle, with short broad acute lobes, and 

 coarsely and often doubly serrate, with glandular teeth, as they unfold villose on 

 both surfaces, and often more or less tinged with red, when the flowers open, usually 

 in the last week of May, roughened above by short closely appressed pale hairs and 

 glabrous below with the exception of a few hairs on the slender midribs and remote 



primary veins, and at maturity thin, glabrous, and bright yellow-green on the upper 

 surface, pale below, 2'-2y long, lf-2^' wide, usually conspicuously concave by the 

 gradual turning down of the blades from the midribs to the margins, and drooping 



