450 TREES OF NORTH AMERICA 



open early in May, and at maturity thick and firm, almost smooth, conspicuously yel- 

 low-green, usually about 2' long and If wide, with prominent midribs often bright 

 red on the lower side toward the base, and 4-6 pairs of slender primary veins arching 

 to the points of the lobes; their stipules slender, nearly terete, glandular, glabrous or 

 sometimes puberulous while young, V-\\' long; on vigorous shoots often broadly 

 ovate, truncate or slightly cordate at tne base, more coarsely serrate and more deeply 

 lobed and frequently 4' long and 3' wide. Flowers cup-shaped, |'-f ' in diameter, on 

 slender elongated pedicels, in loose compound glabrous or rarely puberulous many- 

 flowered corymbs, with oblanceolate or linear acute glandular caducous bracts and 

 bractlets; calyx-tube narrowly obconic, glabrous, more or less deeply tinged with red, 

 the lobes elongated, acuminate, glandular-serrate, or often nearly entire; stamens 

 usually 5, sometimes 6-8; anthers large, dark reddish purple; styles usually 3, sur- 

 rounded at the base by a narrow ring of pale tomentum. Fruit ripening and falling 

 early in September, on long slender pedicels, in many-fruited drooping clusters, short- 

 oblong, full and rounded at the ends, crimson, very lustrous, marked by occasional 

 small dark dots, about \' long; calyx enlarged, conspicuous, with erect and incurved 

 glandular-serrate lobes, bright red toward the base on the upper side; flesh thin, 

 yellow, dry and mealy j with a disagreeable flavor; nutlets usually 3, light chestnut- 

 brown, prominently grooved and ridged on the back, with a broad rounded ridge, 

 about \' long. 



A tree, often 30 high, with a tall straight trunk 10'-15' in diameter, covered with 

 pale gray-brown or nearly white scaly bark, stout ascending branches forming an 

 open irregular rather compact head, and stout glabrous branchlets dark green more 

 or less tinged with red when they first appear, becoming bright chestnut-brown or 

 orange-brown and lustrous, and ultimately ashy gray, and armed with occasional 

 thick mostly straight bright chestnut-brown shining spines l^'-2' long. 



Distribution. Rich moist hillsides and the borders of streams and swamps, 

 neighborhood of Montreal and southern Ontario to the coast of southern Maine, 

 central and western Massachusetts, western New York, Rhode Island, and eastern 

 Pennsylvania; most abundant and of its largest size on the hills of Worcester 

 County, Massachusetts. In Sellersville, Bucks County, Pennsylvania, in a form of 

 this species (var. villipes, Ashe) the young branchlets, petioles, and corymbs are 

 often puberulous and the under surface of the leaves more or less hairy, particularly 

 on the midribs and veins. 



82. Crataegus acclivis, Sarg. 



Leaves oblong-ovate, acuminate, broadly cuneate or rounded at the entire base, 

 coarsely doubly serrate above, with straight gland-tipped teeth, and deeply divided 

 into numerous wide-spreading acuminate lateral lobes, when they unfold tinged with 

 red, densely villose on the upper surface, pubescent along the midribs and veins 

 below, about half grown when the flowers open during the last week of May and 

 then light yellow-green, slightly roughened above by short white hairs and pubescent 

 along the midribs and veins below, and at maturity membranaceous, dark yellow- 

 green and nearly smooth above, pale yellow-green and glabrous below, 2'-3' long, 

 2'-2' wide, with stout yellow midribs and 5 or 6 pairs of primary veins extending 

 obliquely to the points of the lobes; their petioles slender, slightly wing-margined 

 at the apex, glandular, with numerous small dark glands, densely villose early in the 

 season, becoming puberulous or glabrous in the autumn, l^'-2' long; on vigorous 

 shoots broadly ovate, acuminate, cordate at the wide base, deeply divided into wide 



