92 NEW YORK STATE MUSEUM 



lobes; flesh thick, deeply tinged with red; nutlets 4 or 5, acute at 

 the base, abruptly narrowed and rounded or acute at the apex, 

 rounded and grooved or irregularly ridged on the back, about 7 mm 

 long, and 3.5-4 mm wide. 



A shrub 3-4 m high, with stems covered with dark gray-brown 

 bark, ascending branches and stout nearly straight branchlets dark 

 orange-green and marked by large pale lenticels when they first 

 appear, becoming dark chestnut-brown and lustrous in their first 

 season and dull gray-brown the following year, and armed with 

 stout straight purplish shining spines 3.5-4 cm long. 



Hillsides, Coopers Plains, G. D. Cornell (;^6i, type), May 2.(i 

 and September 21, 1906. 



Crataegus plana Sargent 



Hillsides, Coopers Plains, G. D. Cornell ( ^ 2) , September 30, 

 1905, May 25, 1906, (;^ 36), October i, 1905, May 26, 1906, 

 (;^ioi), September 21, 1906, June 5, 1907; also in the Genesee 

 valley and near Buffalo, New York. 



Crataegus dissona Sargent 



Rhodora V. 60 (1903); Bot. Gazette XXXV. 379; Acad. Sci. Phila. Proc. 

 601 (1905). 



Coopers Plains, G. D. Cornell (;^4), October 8, 1905, May and 

 October 1906 ( ;^ 53), October i, 1905, May 26, 1906; also Illinois 

 to western and southern New England and to eastern Pennsylvania. 



Leaves scabrate 



Crataegus ovatifolia n. sp. 



Leaves ovate, long-pointed and acuminate at the apex, gradually 

 or abruptly narrowed and concave-cuneate at the entire base, finely 

 often doubly serrate above, with straight glandular teeth, and slightly 

 divided above the middle into 3 or 4 pairs of narrow acuminate 

 spreading lobes ; deeply tinged with red and covered by soft white 

 hairs on the upper surface when they unfold, about half grown 

 when the flowers open at the end of May and then very thin, yellow- 

 green above and glabrous below, and at maturity thin, dark yellow- 

 green, slightly hairy and scabrate on the upper surface, pale bluish 

 green on the lower surface, 4-5 cm long and 3-3.5 cm wide, with 

 thin midribs and primary veins ; petioles very slender, slightly wing- 

 margined at the apex, sparingly villose on the upper side while 



il 



