Il6 ROCHESTER ACADEMY OF SCIENCE. 



marked by occasional pale dots, about 1.5 cm. long and 1.2 cm. wide ; 

 calyx sessile with a broad shallow cavity and usually erect, enlarged 

 coarsely serrate lobes villose on the upper side and often deciduous 

 h'om the ripe fruit ; flesh thick, yellow, rather juicy ; nutlets usually 

 5, acute at the ends, ridged with a high broad ridge or rounded and 

 slightly grooved on the back, 7-9 mm. in length. 



A tree 8-10 m. in height with a short trunk occasionally i dm. in 

 diameter covered with smooth light gray bark, numerous erect 

 branches forming an oblong open very irregular head, and stout 

 slightly zigzag branchlets coated when they first appear with long 

 matted pale hairs, light red-brown, lustrous, marked by small pale 

 lenticels and pubescent at the end of their first season, becoming dull 

 red or orange-brown the following year, and armed with stout straight 

 or slightly curved bright red-brown shining spines from 3 to 5 cm. 

 long. Flowers during the last week of May. Fruit ripens the 

 middle of September and soon falls. 



Rochester ; steep banks of the gorge of the Genesee River ; 

 common, C. S. Sargent, September 19, 1900, Jo/m Dunbar, May 

 and September, 1901, September, 1902 ; Rush, M. S. Baxter, June, 

 1902 ; Niagara Falls, New York, C. S. Sargent, September 21, 1900. 



Crataegus pedicellata, Sargent, Bot. Gazette, xxxi. 226 (1901) ; 

 Si/va A^. Am. xiii. 121, t. 677. 



One of the largest and most beautiful Thorn-trees of the northern 

 United States. Common throughout Monroe and Ontario Counties. 

 Abundant at Chippewa, Ontario. 



§ TENUIFOLIAE. 



Fruit medium size, oblong, pyriform or rarely subglobose, crimson or 

 scarlet, usually lustrous ; nutlets 2-3, generally ridged on the back ; 

 corymbs usually many-flowej^ed, glabrous or slightly villose; 

 stamens §-20 ; anthers red, pink or rose color : leaves memb7-an- 

 aceous, rarely becoming thick in the autumn, usjially villose on 

 the upper S7irface while yo7ing, smooth or rarely scabrate at 

 maturity. 



Stamens less than 10. 

 Leaves oblong-ovate to oval, dark bluish green, becoming 

 thick in the autumn ; stamens 5 ; anthers pink ; fruit 

 oblong-obovate, crimson; nutlets 2-5. 22. C. parviflora. 



