462 



TREES OF NORTH AMERICA 



her, in few-fruited drooping clusters, short-oblong, full and rounded at the ends, or 

 subglobose and flattened at the ends, dull dark red or rusty orange-red marked by 



occasional dark dots, and about ^' long; calyx only slightly enlarged, the lobes spread- 

 ing or erect and frequently deciduous before the fruit ripens; flesh thin, yellow, dry 

 and mealy; nutlets 2 or 3, broad and rounded at the base, acute at the apex, con- 

 spicuously grooved and ridged on the back, with a broad rounded ridge, about \' 

 long. 



A tree, occasionally 25 high, with a straight trunk 4 '-6' in diameter, covered with 

 thin dark gray-brown bark, thin rather erect branches forming a narrow open head, 

 and slender branchlets, orange-green, glabrous or sometimes pubescent when they 

 first appear, becoming bright chestnut-brown and lustrous, and ashy gray or gray 

 tinged with red during their second year, and armed with thin straight or slightly 

 curved bright chestnut-brown spines f '-1^' long. 



Distribution. Banks of streams and open hillsides; Ontario, central Michigan, 

 central Iowa, Missouri from Webster in the neighborhood of St. Louis to Springfield, 

 and in middle Tennessee. 



XI. INTRICATE. 



Stamens 10 ; leaves broadly ovate to oval. 



Fruit depressed-globose, yellow-green flushed with russet red ; anthers pale yellow ; calyx- 

 lobes without stalked glands. 93. C. Boyntoni (A, C). 

 Fruit subglobose, red or russet-red; anthers pale rose color; calyx-lobes with stalked 

 glands. 94. C. Buckleyi (A). 

 Stamens 20. 



Leaves oval to ovate or oblong-obovate ; fruit short-oblong, dull red, often with a bright 

 russet face ; stamens usually 5-15 ; anthers small, pale yellow. 95. C. venusta (C). 

 Leaves oblong-ovate to elliptical or obovate; fruit subglobose to short-oblong, yellow or 

 orange-yellow, more or less flushed with red ; anthers large, purple. 



96. C. Sargenti (C). 



93. Crataegus Boyntoni, Beadl. 



Leaves broadly ovate to oval, acute, full and rounded or cuneate at the entire 

 glandular base, sharply and often doubly serrate above, with glandular teeth, and 



