26 NEW YORK STATE MUSEUM 



SOME ADDITIONS TO THE CRATAEGUS FLORA OF 

 WESTERN NEW YORK 



BY C. S. SARGENT 



The following paper is based chiefly on collections and observa- 

 tions made by IVIr John Dunbar of Rochester in Buffalo and 

 Niagara Falls between 1901 and 1906. In it are also included a few 

 species distinguished at Rochester since the publication in the fourth 

 volume of the Proceedings of the Rochester Academy of Science 

 in 1903 of my paper on Crataegus in Rochester, and a few others 

 discovered in the valley of the Genesee river south of Rochester by 

 Messrs Baxter and Dewing of Rochester, and in Canandaigua and 

 Chapinville, Ontario co. by the Rochester botanists. 



I NUTLETS WITHOUT VENTRAL CAVITIES 



I CKUS-GALU 



Leaves obovate, cuneate, coriaceous, dark green and shining above, 

 mostly glabrous, usually serrate only above the middle, their veins 

 thin except on vigorous shoots and often within the parenchyma ; 

 calyx glabrous ; fruit oblong to subglobose ; nutlets 1-3, obtuse and 

 rounded at the ends, prominently ridged on the back. 



Veins within the parenchyma 

 Stamens 10 or less 

 Anthers rose color ..i C. crus-galli var. pyracanthifolia 



Anthers white 2 C. arduennae 



Veins prominent 

 Anthers pale pink 



Stamens 9-10 3 C. geneseensis 



Stamens 10-20 



Flowers at least 1.8 cm in diameter, in broad many-flowered corymbs; 



leaves broadly ovate; fruit crimson; spines stout.. 4 C. robusta 



Flowers not more than 1.2 cm in diameter, in ^ few-flowered 



corjmibs ; leaves narrowly obovate; fruit bright cherry-red; spines 



slender 5 C. cerasina 



Crataegus crus-galli var. pyracanthifolia Alton 



Hort. Kew. 11. 170 (1788). Sargent, Silva N. Am. XIII. 39, t. 637; 

 Bot. Gazette XXXV. 100; Man. 369. 



Niagara Falls, J. Dunbar and C. S. Sargent (# 17), September 

 16, 1904, J. Dunbar, September 27, 1905 and June 1906 ; Rochester, 

 Baxter and Dewing ( # 314), June 10 and October 15, 1905; also 

 at Niagara on the Lake, Ontario and in Delaware. 



