ROSACES 



539 



tube and spreading reflexed serrate lobes; flesh thin, yellow, dry and mealy; nutlets 2 or 

 3, \' long and nearly as broad, full and rounded at the ends, the ventral cavities broad and 

 deep. 



A tree, 20-25 high, with a tall straight trunk sometimes 8' in diameter, stout wide- 

 spreading branches forming a symmetrical round-topped head, and very slender nearly 



Fig. 495 



straight branchlets, light orange-green when they first appear, becoming bright red-brown 

 and lustrous at the end of their first season and darker the following year, and unarmed, or 

 sparingly armed with slender nearly straight purple shining spines about 4' long. 



Distribution. Oak-woods in moist rich soil near the banks of the Calumet River, Calu- 

 met, Cook County, Illinois. 



144. Crataegus Deweyana Sarg. 



Leaves ovate, acuminate or abruptly long-pointed at apex, abruptly narrowed and 

 concave-cuneate at the entire often unsymmetric base, coarsely doubly serrate above with 

 straight or incurved gland-tipped teeth, and slightly divided above the middle into several 

 pairs of small acuminate spreading lobes, about one third grown when the flowers open dur- 

 ing the last week of May and then membranaceous, dark yellow-green, and covered above 

 with short lustrous white hairs, and light yellow-green and glabrous below, and at maturity 

 thin, yellow-green and scabrate on the upper surface, pale on the lower surface, 3'-4' long, 

 and 2'-f ' wide, with a stout midrib deeply impressed on the upper side, and 6 or 7 pairs of 

 thin primary veins arching to the point of the lobes; petioles stout, wing-margined at apex, 

 deeply grooved, sparingly villose on the upper side, soon glabrous, glandular with occa- 

 sional minute dark glands, usually dull orange color in the autumn, f '-!' in length; leaves 

 at the end of vigorous shoots more deeply lobed and more coarsely serrate, subcoriaceous, 

 often 4' long and 3|' wide, and gradually narrowed into stout broad-winged coarsely glandu- 

 lar petioles, their stipules foliaceous, stipitate, lunate, acutely lobed, glandular-serrate 

 with minute dark red glands, sometimes \' long, persistent through the season. Flow- 

 ers about \' in diameter, on slender hairy pedicels, in wide lax slightly villose corymbs; 

 calyx-tube narrowly obconic, villose at base, glabrous above, the lobes slender, elongated, 

 acuminate, finely glandular-serrate usually only above the middle, dark green and glabrous 

 on the outer surface, villose on the inner surface; stamens 7-10, usually 10; anthers small, 

 dark rose color; styles 2 or 3, usually 2. Fruit ripening from the first to the middle of Octo- 

 ber and falling a few weeks later, on long slender puberulous pedicels, in wide many-fruited 

 drooping clusters, subglobose to short-oblong, rounded at the ends, scarlet, lustrous, 



