470 TREES OF NORTH AMERICA 



crimson, lustrous, marked by large pale dots, villose especially at the ends, f'-f ' m diameter; 

 calyx prominent, with a long villose tube, and erect villose persistent lobes dark red on 

 the upper side below the middle, their tips slightly spreading or incurved; flesh thick, yel- 

 low, dry and mealy; nutlets 3-5, narrowed and rounded at apex, rounded at the broad base, 

 slightly grooved on the back, '-J' long. 



A tree, of ten 30 high, with a tall trunk 8 '-12' in diameter, covered with dark scaly bark, 

 stout ascending branches forming a narrow irregular head, and slender zigzag branchlets 

 thickly coated when they first appear with long white hairs, light orange-brown, lustrous, 

 pubescent and marked by pale lenticels at the end of their first season, dull gray-brown and 

 glabrous the following year, and armed with slender straight or slightly curved purple 

 ultimately ashy gray spines 2'-2|' long. 



Distribution. In dense woods on the rich bottom-lands of the Red River near Fulton, 

 Hempstead County, Arkansas; river banks; western Texas (Guadalupe River, near Vic- 

 toria, Victoria County; Cibolo River, Sutherland Springs, Wilson County; San Antonio 

 River, Bexar County; C. Mackensenii Sarg.). 



74. Crataegus viburnifolia Sarg. 



Leaves elliptic to ovate, oval or slightly obovate, acute or rounded at apex, concave- 

 ouneate at the entire base, coarsely often doubly serrate above with straight glandular 

 teeth, and slightly and irregularly divided above the middle into 2 or 3 pairs of small acute 



Fig. 426 



lobes, half grown when the flowers open about the 20th of March and then thin, yellow- 

 green and roughened above by short white hairs and hoary-tomentose below, and at matu- 

 rity thick, deep green, very lustrous and scabrate on the upper surface, coated on the lower 

 surface with pale hairs, 2|'-3|' long, and 2'-2^' wide, with a prominent midrib and primary 

 veins; petioles slightly wing-margined at apex, densely hoary-tomentose early in the season, 

 becoming glabrous, f'-l|' in length. Flowers about f in diameter, on long slender to- 

 mentose pedicels, in wide lax mostly 5-12-flowered corymbs, with large lanceolate to spatu- 

 late foliaceous bracts and bractlets slightly serrate above the middle, and generally persist- 

 ent until after the petals fall; calyx-tube narrowly obconic, thickly coated with matted 

 white hairs, the lobes gradually narrowed from the base, long, slender, acuminate, lacini- 

 ately glandular-serrate, slightly villose on the outer surface, densely villose on the inner 

 surface; stamens 20; anthers white; styles 4 or 5. Fruit ripening early in October, on long 

 slender drooping slightly hairy pedicels, in few-fruited clusters, subglobose, bright canary 

 yellow, about 1' in diameter; calyx little enlarged, with spreading lobes; flesh thick, light 

 yellow, soft and succulent; nutlets 4 or 5, gradually narrowed and rounded at the ends, 

 irregularly ridged on the back with a broad grooved ridge, f ' long. 



