424 TREES OF NORTH AMERICA 



with conspicuous bracts and bractlets; calyx-tube narrowly obconic, hoary-tomentose, 

 the lobes narrow, acuminate, coarsely glandular-serrate, with bright red glands, vil- 

 lose on the outer, tomentose on the inner surface; stamens 20; anthers large, light 

 yellow; styles 4 or 5, surrounded at the base by a broad ring of hoary tomentum. 

 Fruit ripening late in August and early in September, on stout pedicels, in drooping 

 few-fruited villose clusters, short-oblong to subglobose, full and rounded at the ends, 

 more or less pubescent, scarlet marked by occasional large dark dots, '-!' in diam- 

 eter; calyx prominent, hairy, with large erect and incurved lobes usually deciduous 

 before the fruit ripens; flesh thick, yellow, subacid, dry and mealy; nutlets 4 or 5, 

 thin, rounded and obscurely ridged on the back, light brown, ^' long. 



A tree, sometimes 40 high, with a tall trunk often 18' in diameter, heavy wide- 

 spreading smooth ashy gray branches forming a broad round-topped and often sym- 

 metrical head, and stout branchlets covered at first with a thick coat of long white 

 matted hairs, villose during their first season, becoming glabrous in their second year, 

 and armed with occasional straight thick bright chestnut-brown shining spines l'-2' 

 long. 



Distribution. Low rich soil usually on the bottom-lands of streams; northern 

 Ohio to eastern Dakota, eastern Nebraska, and eastern Kansas. 



57. Crataegus sera, Sarg. 



Leaves oblong-ovate, acute or acuminate, rounded, truncate, or slightly cordate at 

 the broad base, irregularly divided into 4 or 5 pairs of short acute lateral lobes, and 



sharply and sometimes doubly serrate nearly to the base, with straight glandular teeth, 

 unfolding about the 1st of May with the opening of the flowers and then covered above 

 with short soft white hairs and tomentose below, and at maturity membranaceous, 

 dark yellow-green and glabrous on the upper surface, pubescent on the lower sur- 

 face, 2'-4' long, 2^ '-3' wide, with slender midribs appressed above and thin remote 

 primary veins extending to the points of the lobes; their petioles slender, tomentose, 

 ultimately pubescent, I'-l-J' long; on vigorous shoots more deeply lobed and often 

 4'-5' long and 3'^4' wide. Flowers ' in diameter, on stout pedicels, in compact 

 compound many-flowered tomentose corymbs; calyx-tube broadly obconic, coated 

 with broad matted pale hairs, the lobes broad, acute or acuminate, glandular-ser- 

 rate, with large dark glands, tomentose on the outer surface and villose on the inner 



