408 



TREES OF NORTH AMERICA 



dark brown or ashy gray, aud armed with stout straight or slightly curved dull red- 

 brown or purplish spines usually about 1^' long. 



Distribution. Low moist rich soil on the bottoms of the Mississippi River near 

 the village of Kahokia, Illinois, a few miles south of East St. Louis (John D. Kellogg, 

 October 1902, May 1903). 



42. Crataegus atrorubens, Ashe. 



Leaves ovate, acute, usually full and rounded or sometimes broadly cuneate or 

 truncate at the entire base, coarsely and usually doubly serrate above, and often 



divided into 2 or 3 pairs of short acute lobes, about half grown when the flowers open 

 late in April or early in May and then slightly roughened above by short scattered 

 white hairs, and furnished below with conspicuous axillary tufts of pale toraentum, 

 and at maturity thin, glabrous, dark dull green and smooth on the upper surface, 

 light yellow-green on the lower surface, about 2' long and 1^' wide, or on leading 

 shoots frequently 3' long, and 2\' wide, with thin midribs and 4 or 5 pairs of slender 

 primary veins; their petioles slender, nearly terete, more or less densely villose at 

 first, soon becoming glabrous, I'-l^' long. Flo"wers about |' in diameter, on slender 

 elongated villose pedicels, in broad loose compound glabrous or villose corymbs; 

 calyx-tube narrowly obconic, coated throughout or only at the base with hoary to- 

 mentum, the lobes short, acute, finely glandular-serrate, villose particularly on the 

 inner surface; stamens 20; styles 4 or 5, surrounded at the base by a narrow ring of 

 pale tomentum. Fruit ripening and falling early in October, on slender pedicels, in 

 drooping few-fruited clusters, subglobose to short-oblong, full and rounded at the 

 ends, dark red; calyx somewhat enlarged, with spreading lobes usually deciduous 

 before the fruit ripens; nutlets 4 or 5, thin, rounded and sometimes obscurely grooved 

 on the back, about ^-^ long. 



A tree, sometimes 30 high, with a tall trunk 12'-18' in diameter, covered with 

 dark red-brown scaly bark, thin erect and spreading branches forming a compact 

 rather narrow head, and slender glabrous branchlets marked by occasional dark 

 lenticels, dark green more or less tinged with red when they first appear, becoming 

 dark chestnut-brown and very lustrous and bright reddish brown in their second year, 

 and usually unarmed. 



Distribution. Rich bottom-lands of the Mississippi River, East St. Louis, Illinois; 

 not common. 



