ROSACE.E 



425 



red, marked by large pale dots, fV^iV long, and about f thick; calyx small, with spreading 

 appressed lobes mostly deciduous from the ripe fruit; flesh thin, hard, slightly juicy, green 

 or greenish yellow; nutlets 3 or 4, thin, acute or obtuse at the ends, ridged on the back 

 with a high broad deeply grooved ridge, about \' long. 



A tree, 20-25 high, with a tall straight trunk often a foot in diameter, covered with 

 dark brown scaly bark, stout wide-spreading branches forming a broad symmetrical round 

 or flat-topped head, slender straight branchlets light orange-green and sparingly villose at 

 first, becoming light orange-brown during their first season, light or dark gray-brown the 

 following year, and armed with numerous stout slender straight orange-brown shining 

 spines l'-2' in length, long persistent on the branches and trunk, finally ashy gray, and 

 becoming sometimes a foot long, with long slender lateral spines. 



Distribution. Dry limestone hills and low moist bottom-lands, Bucks, Berks and Dela- 

 ware counties, eastern Pennsylvania; at Chapin, Ontario County, New York. 



28. Cratsegus collina Chapm. 



Leaves obovate to oval or occasionally to rhombic, acute, gradually narrowed or broadly 

 cuneate at the entire base, and irregularly and often doubly serrate above with glandular 

 incurved or straight teeth, when they unfold bright red and covered with soft pale hairs 



Fig. 380 



most abundant on the under side of the midrib and principal veins, less than one third 

 grown when the flowers open at the end of April, and at maturity subcoriaceous, yellow- 

 green on the upper surface, paler on the lower surface, glabrous with the exception of a 

 few hairs on the under side of the stout yellow midrib and 4 or 5 pairs of slender primary 

 veins, If '-2' in length, and l'-lj' wide; petioles slender, villose, soon glabrous, more or less 

 winged toward the apex, j' f long; leaves at the end of vigorous shoots frequently divided 

 into short broad acute lateral lobes, more coarsely dentate and often 3' long and 2f ' wide, 

 with a stout broadly winged petiole generally light red like the lower side of the base of 

 the midrib. Flowers f ' in diameter, on long stout pedicels, in broad many-flowered vil- 

 lose corymbs; calyx-tube broadly obconic, villose particularly toward the base, the lobes 

 gradually narrowed from a broad base, acuminate, usually glabrous on the outer 'surface, 

 villose on the inner surface, finely glandular-serrate with dark glands, bright red toward the 

 apex ; stamens usually 20 ; anthers large, pale yellow ; styles 5 . Fruit ripening in September, 

 on stout elongated pedicels, in few-fruited erect or drooping puberulous clusters, subglobose 

 but sometimes rather broader than long, dull red, marked by small pale dots, j'~ in 

 diameter; calyx enlarged, the lobes closely appressed, glandular-serrate, mostly persistent; 



