428 



TREES OF NORTH AMERICA 



villose lobes often deciduous from the ripe fruit; flesh thick, light yellow, dry and 

 mealy; nutlets 4 or 5, thin, full and rounded at the apex, narrowed and acute at the 

 base, grooved with a broad shallow groove and sometimes irregularly ridged on the 

 back, about T 5 g' long. 



A tree, 20-25 high, with a tall trunk sometimes 6' in diameter, slender branches 

 forming a narrow open head, and thin nearly straight branchlets thickly covered at 

 first with long lustrous white hairs, dull light reddish brown and puberulous at the 

 end of their first season, becoming dark gray-brown, and armed with stout straight or 

 slightly curved dark purple shining spines usually about !' long, or unarmed. 



Distribution. Banks of small streams in moist soil from Doe Run to Bismarck, 

 St. Francois County, Missouri. 



61. Crataegus Canadensis, Sarg. 



Leaves ovate, short-pointed, slightly lobed usually only above the middle, with 

 short broad acute lobes, and coarsely and frequently doubly serrate to the broadly 

 cuneate or on leading shoots truncate base, with spreading glandular teeth, coated 

 above in early spring with soft white hairs, and below with dense hoary tomentum, 

 about one third grown when the flowers open at the end of May, and at maturity thin 

 and firm in texture, blue-green, glabrous or scabrate on the upper surface, pale and 

 pubescent on the lower surface along the midribs and primary veins, 2'-2|' long, 1^' 

 to nearly 3' wide ; their petioles slender, glandular, often more or less winged above, 

 at first tomentose, ultimately nearly glabrous, '-!' long. Flowers about f ' in diam- 

 eter, in broad loose tomentose corymbs ; calyx-tube broadly obconic, villose, with 



long matted hairs, the lobes lanceolate, villose, and glandular, with large red stipitate 

 glands ; stamens 20 ; anthers small, nearly white ; styles 5, surrounded at the base 

 by a thin ring of pale tomentum. Fruit ripening early in October and falling grad- 

 ually until after midwinter, on stout pedicels, in erect slightly villose few-fruited clus- 

 ters, short-oblong to subglobose, crimson, lustrous, marked by large scattered pale 

 dots, slightly hairy toward the ends, ^'-f ' long, '-' wide; calyx prominent, the lobes 

 gradually narrowed from broad bases, elongated, glandular, villose, spreading or 

 reflexed, often deciduous before the fruit ripens; flesh thin, pale yellow, dry and 

 mealy; nutlets 5, thin, rounded and irregularly ridged on the back, ^' long. 



