REPORT OF THE STATE BOTANIST ICH2 53 



CRATAEGUS IN NEW YORK 



So much has been learned of the characters and distribution of 

 the different species of Crataegus in New York during the last 

 three or four years through the collections and observations of 

 a number of students of these plants that it now seems desirable 

 to join in a brief summary this information with that contained 

 in the various publications on the subject which have appeared 

 in the last ten years. 



In western New York Crataegus has been more systematically 

 and carefully collected and studied than in any other part of 

 North America, but there is still much field work to be done be- 

 fore the species of the eastern, southern and central parts of the 

 State are equally well known, and it is hoped that the publica- 

 tion of this synopsis of the work already accomplished may lead 

 to further investigations and collections. 



C. S. Sargent 

 Arnold Arboretum 



Jamaica Plain, Mass. 

 December 1912 



KEY TO THE SPECIES 



Synopsis of the groups 



A Nutlets without ventral cavities 



(Groups Crus-galli-Anomalae) 



B Nutlets with longitudinal cavities on their ventral faces 



(Group Tomentosae) 

 Crus-galli 

 Leaves subcoriaceous to coriaceous, obovate to oblong-obovate, 

 usually rounded, or acute or acuminate at the apex, mostly 

 serrate only above the middle, without lobes except on vigor- 

 ous shoots, their veins thin and sometimes within the paren- 

 chyma, petioles short, usually eglandular ; flowers in many- 

 flowered corymbs; fruit subglobose to short-oblong, flesh thin, 

 usually green. 



* Veins of the leaves within the parenchyma; stamens 10 



Anthers rose color C. crus-galli 



Anthers white C. arduennae 



** Veins of the leaves prominent 



f Glabrous with the exception of occasional hairs on the 

 young leaves ; anthers pale pink 



