416 



TREES OF NORTH AMERICA 



flowers open; calyx-tube narrowly obconic, glabrous, the lobes narrow, acuminate, 

 glandular-serrate, with small dark red stipitate glands, glabrous on the outer, pubes- 

 cent on the inner surface; stamens 10; anthers bright reddish purple; styles 4 or 5, 

 surrounded at the base by tufts of pale hairs. Fruit ripening during the first half 

 of September and soon falling, on slender glabrous pedicels, in drooping clusters, 

 obovate to subglobose, crimson or purplish, marked by numerous small pale dots, 

 slightly pruinose, ^' | ' long, about ^' wide ; calyx small, with reflexed and appressed 

 or erect and incurved serrate lobes dark red on the upper side below the middle, 

 often deciduous from the ripe fruit; flesh thin, yellow, juicy, acid, and edible; nut- 

 lets 4 or 5, thin, narrowed and acute at the ends, rounded and slightly grooved or 

 obscurely ridged on the back, about ^' long. 



A tree, sometimes 25 high, with a trunk 4'-6' in diameter and often 6 long, 

 covered with dark gray or nearly black bark separating into thin plate-like scales, 

 numerous branches forming a round-topped head, and slender glabrous branchlets 

 dark yellow-green when they first appear, becoming dark reddish brown at the end 

 of their first season, olive-green in their second year, and ultimately dark gray- 

 brown, and armed with small straight light red-brown shining spines ^'-f ' long. 



Distribution. Woods and river banks in dry clay soil; May wood, near Chicago, 

 Illinois. 



50. Crataegus pentandra, Sarg. 



Leaves oval or ovate, acuminate, broadly cuneate or rarely rounded at the entire 

 base, divided above the middle into numerous short acute or acuminate lobes, and 

 coarsely and often doubly serrate, with straight or incurved teeth tipped with small 



dark glands, nearly fully grown and very thin when the flowers open at the end of 

 May, and at maturity membranaceous, dark green and roughened above by short 

 rigid pale hairs, pale and glabrous below, 2'-2^' long, l^'-2' wide, with slender 

 yellow midribs and thin primary veins extending to the points of the lobes; their 

 petioles slender, often winged toward the apex, glandular, with minute dark glands, 

 usually about 1' long; on vigorous shoots more deeply lobed and often 4' long and 

 3' wide, their stipules foliaceous, lunate, very coarsely glandular-serrate, often \' 

 long. Flowers f'-f ' in diameter, on elongated slender pedicels, in compact com- 

 pound few-flowered glabrous corymbs; calyx-tube narrowly obconic, glabrous, dark 



