424 TREES OF NORTH AMERICA 



A tree, 20-30 high, with a trunk occasionally a foot in diameter, stout branches spread- 

 ing nearly at right angles and forming a round or flat-topped head, or sometimes ascending 

 and forming a narrow open irregular head, and branchlets coated at first with pale decidu- 

 ous pubescence, becoming light orange-brown or ashy gray, and armed with slender straight 

 light orange-brown or gray spines 2'-3' long. 



Distribution. Common and generally distributed; rich hillsides; valley of the Chateau- 

 gay River, Quebec, to the valley of the Detroit River, Ontario, southward through western 

 New England to Delaware, and along the Appalachian Mountains to northern Georgia, 

 ascending in North Carolina and Tennessee to altitudes of nearly 6000, and westward 

 through New York, Ohio and Indiana to southern Michigan, Indiana, Illinois, southern 

 Wisconsin, southeastern Minnesota, and in central Iowa. A form (var. canescens Britt.), 

 densely hoary-tomentose on the under surface of the leaves, and on the petioles and 

 corymbs, occurs in Bucks County, Pennsylvania, and near Albany, Albany County, New 

 York; and a form (var. microphylla Sarg.) with smaller leaves and compact few-flowered 

 corymbs has been found at Linesville Crawford County, Pennsylvania. 



27. Crataegus pausiaca Ashe. 



Leaves oblong-obovate to oval, rounded or acute at apex, gradually narrowed from near 

 the middle to the concave-cuneate entire base, and finely doubly serrate above with straight 

 glandular teeth, more than half grown when the flowers open from the 20th to the end of 



Fig. 379 



May and then membranaceous, dark yellow-green, and slightly villose above and along 

 the under side of the midrib and veins, and at maturity glabrous, dark yellow-green above, 

 paler below, 2'-2|' long, and !?'-!' wide, with a slender yellow midrib, and 5 or 6 pairs of 

 primary veins extending very obliquely to the end of the leaf; petioles slender, wing-mar- 

 gined above the middle, villose only early in the season, f'-l' in length; leaves at the end 

 of vigorous shoots elliptic to rhombic, long-pointed, slightly or deeply divided into broad 

 lateral lobes, coarsely serrate, often 3'-4' long and 2'-2^' wide. Flowers \' in diameter, 

 on long slender hairy pedicels, in broad many-flowered thin-branched villose corymbs; 

 calyx-tube narrowly obconic, villose below with closely appressed white hairs, glabrous 

 above, the lobes abruptly narrowed from the base, slender, acuminate, tipped with minute 

 dark glands, entire or occasionally obscurely toothed above the middle, glabrous on the 

 outer surface, villose on the inner surface; stamens 10-15, rarely 20; anthers dark rose 

 color; styles 2 or 3, surrounded at base by a broad ring of pale tomentum. Fruit ripening 

 about the middle of October, on elongated slender slightly hairy pedicels, in drooping 

 many-fruited clusters, short-oblong to obovoid, broad and rounded at the ends, dull brick- 



