ROSACELE 



545 



Fruit ripening at the end of September and often remaining on the branches for several 

 weeks longer, on erect slender pedicels, in broad open many-fruited usually slightly villose 

 clusters, globose, often hairy at the ends until nearly ripe, crimson, very lustrous, j'-f in 

 diameter; calyx large and conspicuous, the lobes coarsely serrate, reflexed and persistent; 

 flesh thin, dark yellow, dry and mealy; nutlets 2 or 3, about j' long and wide, broad and 

 rounded at the ends, the ventral cavities deep and irregular. 



A tree, occasionally 15 high, with a tall stem 5'-6' in diameter, covered with pale close 

 bark, stout wide-spreading branches forming an open rather irregular head, and stout 



Fig. 501 



slightly zigzag glabrous light chestnut-brown very lustrous branchlets, becoming dull red- 

 dish brown in their second year, and armed with numerous slender usually curved very 

 sharp bright chestnut-brown shining spines 2|'-4' long. 



Distribution. Western Vermont (near Middlebury, Addison County) ; central and west- 

 ern New York; southern Ontario (near Toronto) ; northeastern Illinois (Barrington County) ; 

 and eastern Pennsylvania (Bucks and Northampton Counties). 



XIX. DOUGLASIANJE. 

 CONSPECTUS OF THE ARBORESCENT SPECIES. 



Leaves subcoriaceous, lustrous above, obovate to broad-ovate, coarsely serrate, usually 

 lobed; stamens 5-20, normally 10; spines numerous, short and stout. 



150. C. Douglasii. 



Leaves thinner, dull bluish green, lanceolate to oblong-obovate or elliptic, acute at the 

 ends, finely serrate, not lobed; stamens 10-20; spines few, long and slender or wanting. 



151. C. rivularis. 



150. Crataegus Douglasii Lindl. 



Leaves broad-obovate to ovate, gradually narrowed below to the cuneate entire base, 

 coarsely serrate above with minute glandular teeth, and often incisely lobed toward the 

 acute apex, nearly fully grown and coated above and on the midrib and veins below with 

 short pale hairs when the flowers open in May, and at maturity thin, glabrous, dark green 

 and lustrous above, paler below, l'-2' long, and i'-l|' wide; petioles slender, wing-margined 

 above, sparingly glandular, villose early in the season, becoming glabrous, |'-f in length; 

 leaves at the end of vigorous shoots broad-obovate, incisely lobed at the broad apex, often 



