Il6 NEW YORK STATE MUSEUM 



Crataegus asperifolia Sargent 

 Rhodora III 31 (1901) ; N. Y. State Mus. Bui. 105. 64 (1906). 

 Near Albany, Little Falls, Buffalo, Coopers Plains ; also in New 

 England, southern Ontario and the Province of Quebec. 



Crataegus singularis Sargent, N. Y, State Mus. Bui. 

 122. 106 (1908), with more deeply lobed leaves can not otherwise be 

 distinguished from Crataegus asperifolia and probably 

 should be referred to that species. 



Crataegus repulsans Sargent 

 N. Y. State Mus. Bui. 122. 107 (1908). 

 Coopers Plains. 



Crataegus floridula Sargent 

 N. Y. State Mus. Bui. 122. 126 (1908). 



Piseco. 



Crataegus knieskerniana n. sp. 



Glabrous with the exception of the hairs on the young leaves and 

 calyx-lobes. Leaves ovate, acuminate, cuneate at the entire base, 

 coarsely doubly serrate above with straight glandular teeth, and di- 

 vided into five or six pairs of narrow acuminate lateral lobes ; about 

 one-third grown when the flowers open the end of May and then 

 thin, dark yellow-green and roughened above by short white hairs 

 and pale bluish green and glabrous below, and at maturity thin, 

 yellow-green, smooth and lustrous on the upper surface, paler on 

 the lower surface, 6 to 7 cm long and 4.5 to 5 cm wide, with thin 

 midribs, and slender primary veins extending obliquely to the points 

 of the lobes; pedicels slender, slightly wing-margined at the apex, 

 red in the autumn, 2.5 to 3 cm in length ; leaves on vigorous shoots 

 ovate, acuminate, rounded, subcordate or occasionally cuneate at the 

 broad base, coarsely serrate, more deeply lobed, 8 to 9 cm long and 

 wide with glandular petioles. Flowers 1.5 to 1.8 cm in diameter, on 

 long slender pedicels, in wide lax mostly io-13-flowered corymbs, the 

 thin much elongated lower peduncles from the axils of upper leaves ; 

 calyx-tube narrowly obconic, the lobes long, slender, acuminate, 

 entire, slightly dentate near the middle, glabrous on the outer, vil- 

 lose on the inner surface, reflexed after anthesis ; stamens ten ; 

 anthers rose color ; styles three or four. Fruit ripening in October 

 on slender drooping pedicels, short-oblong, rounded at the ends, 

 scarlet, lustrous, marked by large pale dots, 1.3 to 1.4 cm long, i to 

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



