438 



TREES OF NORTH AMERICA 



light-colored, prominently ridged on the back, with a high rounded ridge, about \' 

 long. 



A tree, 15-20 high, with a short trunk 10'-12' in diameter, stout ascending 

 branches forming a broad open irregular head, and slender very zigzag branchlets 

 clothed at first with long matted pale hairs, becoming dark orange-brown and very 

 lustrous before midsummer, glabrous or puberulons during their first winter, bright 

 orange-brown or gray-brown during their first season, and armed with numerous 

 stout straight or slightly curved bright chestnut-brown shining spines 2'-3' long. 



Distribution. Thickets on a dry bank in the Arnold Arboretum and in the valley 

 of the Mystic River at Medford* Massachusetts. 



Often cultivated in the parks and gardens in the neighborhood of Boston; very 

 conspicuous and easily recognized in winter by its ascending remarkably zigzag 

 brauchlets. 



71. Crataegus Champlaiiiensis, Sarg. 



Leaves ovate, acute, rounded, truncate, slightly cordate or broadly cuneate at the 

 base, usually divided into 2 or 3 pairs of short narrow acute lobes, and coarsely and 

 frequently doubly serrate, with glandular teeth, roughened above by short pale 

 hairs and villose below when they unfold, nearly fully grown when the flowers open 

 early in June, and at maturity thick and firm in texture, conspicuously blue-green 

 and glabrous above, light yellow-green and somewhat pubescent below on the slen- 

 der midribs and remote primary veins, 2'-2' long and I'-l^' wide; their petioles 

 slender, more or less tomentose at first, usually becoming glabrous and light red 

 below the middle before autumn, and f '-!' long. Flowers |' in diameter, on short 

 slender villose pedicels, in compact few-flowered compound densely villose corymbs; 



calyx-tube narrowly obconic, coated with thick hoary tomentum, the lobes lanceolate, 

 finely glandular-serrate, tomentose on the outer surface, usually only below the mid- 

 dle, villose on the inner surface; stamens 10; anthers small, light yellow; styles 5, 

 surrounded at the base by tufts of pale hairs. Fruit ripening early in September and 

 usually remaining on the branches during the remainder of the year, on short pedicels, 

 in compact erect villose clusters, obovate or oblong, bright scarlet, marked by scat- 

 tered pale dots, more or less villose or pubescent toward the ends; calyx prominent, 

 persistent, with a long tube, the lobes gradually narrowed from broad bases, acumi- 



