432 



TREES OF NORTH AMERICA 



globose, dull dark red, f'-^' in diameter; calyx prominent, with spreading lobes bright red 

 on the upper side at the base; nutlets 5, acute at the narrow ends, thin, rounded and 

 grooved with a broad shallow groove or irregularly ridged on the back, j'-fV Jong. 



A tree, 20-25 high, with a tall trunk 4 '-6' in diameter, covered with pale bark, small 

 erect branches forming an open irregular head, and slender somewhat zigzag branchlets 

 thickly coated at first with hoary tomentum, reddish brown and lustrous before autumn, 

 ultimately ashy gray, and armed with straight slender gray spines 1|'-1|' long. 



Distribution. Forest-covered bottom-lands of the small tributaries of the Trinity River, 

 Dallas County, Texas; not common. 



36. Crataegus Lettermanii Sarg. 



Leaves obovate, acute or acuminate or rounded and short-pointed at apex, gradually 

 narrowed from near the middle and cuneate at the mostly entire base, coarsely often 

 doubly serrate above with straight or incurved glandular teeth, and frequently slightly and 





Fig. 388 



irregularly divided above the middle into 3 or 4 pairs of short acute lobes, strongly plicate 

 when they unfold and covered with a thick coat of pale tomentum, nearly half grown, 

 roughened above by short pale hairs and pubescent below when the flowers open early in 

 May, and at maturity thick, bright yellow-green and scabrate above, pale and pubescent 

 below on the stout midrib and 4 or 5 pairs of primary veins, about 2' long and \%' wide; 

 petioles stout, more or less winged above the middle, at first tomentose, becoming 

 pubescent or nearly glabrous, usually about f in length; leaves at the end of vigorous 

 shoots broad-oval, acute or acuminate, more coarsely serrate, 2|'-3' long, and 2'-2|' wide. 

 Flowers about f ' in diameter, on short villose pedicels in compact, many-flowered thick- 

 branched densely villose corymbs; calyx-tube narrowly obconic, tomentose, the lobes narrow, 

 acuminate, finely glandular-serrate, villose; stamens 10; anthers small, pale yellow; styles 

 5, surrounded at base by a broad ring of hoary tomentum. Fruit ripening early in October, 

 on stout pubescent pedicels, in few-fruited spreading or drooping clusters, subglobose or 

 occasionally slightly obovoid, rounded and puberulous at the ends, dull orange-red, 

 marked by large pale dots, about \' in diameter; calyx broad, the lobes enlarged, coarsely 

 glandular-serrate, reflexed, often deciduous before the fruit ripens; flesh thin; nutlets 5, 

 prominently ridged on the back with a high rounded ridge, \' long. 



A tree, 18-20 high, with a trunk 6'-8' in diameter, with thin dark brown or nearly black 

 bark separating freely into small plate-like scales, and often armed with thin much- 

 branched spines frequently 7 '-8' long, small erect branches forming a wide open head, and 

 branchlets coated when they first appear with hoary tomentum, dull red-brown, villose or 



