56 NEW YUKK STATE MUSEUM 



reflexed after anthesis; stamens lo, filaments persistent on the fruit; 

 anthers yellow ; styles 3 or 4, densely coated with white hairs from 

 the base nearly to the middle, surrounded by a narrow ring of pale 

 tomentum. Fruit ripening at the end of September, on slender 

 still slightly hairy pedicels, in few- fruited drooping clusters, short- 

 oblong, full and rounded at the ends or slightly narrowed at the 

 apex, dull greenish red, pruinose, marked by large pale dots, about 

 I cm in diameter ; calyx little enlarged, with a deep narrow cavity, 

 and spreading lobes, their tips incurved and often deciduous from 

 the ripe fruit ; flesh thin, yellow, dry and mealy ; nutlets 3 or 4, nar- 

 rowed and rounded at the ends or acute at the apex, irregularly 

 grooved or occasionally slightly ridged on the back, 6-7 mm long, 

 and 4-5 mm wide. 



A shrub, with slender nearly straight glabrous branchlets, green 

 tinged with red when they first appear, becoming bright chestnut- 

 brown, lustrous and marked by numerous pale lenticels in their first 

 season and dull reddish brown the following year, and armed with 

 slender slightly curved or straight chestnut-brown shining spines 

 2.5-3 ^^ long. 



In moist soil, Chapinville, Ontario co., J. Dunbar and C. S. Sargent 

 (;^ E, type), October i, 1902, M. S. Baxter, May 30 and September 

 20, 1903. 



This and Crataegus delawarensis Sargent are the only 

 species of Pruinosae that have yet been seen with 10 stamens and 

 yellow anthers. From C. delawarensis it diflfers in the 

 scabrate young leaves and villose pedicels, and from all other species 

 in the dense covering of hairs on the lower part of the styles. 



IV TENUIFOL.IAE 



Fruit short-oblong to obovate, red or scarlet, lustrous ; anthers 

 rose color or pink; leaves thin, hirsute on the upper surface while 

 young. 



Stamens 10 or less 

 Leaves yellow-green 



Leaves glabrous at maturity; pedicels glabrous 

 Fruit usually short-oblong 

 Stamens 10; anthers pink 



Flowers 1.6 cm in diameter, in wide loose corymbs 



I C. slavini 



Flowers not more than 1.2 cm in diameter, in compact 



corymbs 2 C . b o o t h i a n a 



Stamens 7-10; antliers dark rose color 3 C . s u a v i s 



Fruit obovate 4 C. colorata 



Leaves scabrate at maturity; pedicels villose... 5 C. rubicund a 



