REPORT OF THE STATE BOTANIST 1904 25 



Crataegus durobrivensis Sarg. 



Banks of the Genesee river in the northern part of Rochester. 

 Near North Albany. It has also been found at Niagara Falls by 

 C. S. Sargent and at Buffalo by J. Dunbar. The Rochester thorn 

 has flowers with 20 stamens, rose-red anthers and 4-5 styles. The 

 calyx lobes are slightly hairy inside, the fruit is globose or nearly 

 so and is said to persist on the branches till midwinter. The species 

 has been placed by Professor Sargent in the section Dilatatae, 

 though somewhat aberrant in its characters. In our svnopsis of 

 the species we have placed it temporarily in the section Lobulatae, 

 from which it diverges in its more numerous stamens. 



Crataegus acclivis Sarg. 

 Steep banks of the Genesee river in the northern part of Roches- 

 ter. It has also been found at Rush by M.S. Baxter and at Niagara 

 Falls b}' C. S. Sargent. It is a large fine species easily recognized 

 by its nearly erect branches and its large bright red fruit which is 

 generally a little longer than broad. It sometimes retains, when 

 ripe, some of the hairiness which is so noticeable on the calyx at 

 flowering time. A peculiar feature of the species consists of the 

 broad, lunate, coarsely serrate and persistent stipules which are 

 foimd on young and vigorous shoots. The lowest pair of lobes 

 on some of the large leaves of these shoots is larger than the others. 

 The flowers have 5-7 stamens with pink anthers. This and the 

 next following species belong to the section Lobulatae. 



Crataegus pedicellata Sarg. 



Rochester. The pedicellate thorn is a large, handsome and 

 attractive species scarcely less beautiful in fruit than in flower. 

 The fruit is either oblong or pyriform and of a bright scarlet color. 

 It is crowned by the generally persistent, erect or incurved, glan- 

 dular serrate calyx lobes. Its 10 stamens have rose-red anthers. 



The 10 following species belong to the section Tenuifoliae. 



Crataegus parviflora Sarg. 



Seneca park, Rochester. It has also been found at Rush by 



M. S. Baxter. It may be recognized when in bloom by its loose 



clusters of small flowers supported on long, branched, slender 



peduncles. The stamens are 5-6, the anthers pink and the styles 2-3 . 



Crataegus streeterae Sarg. 

 Genesee Valley park, Rochester. A peculiar feature of this 

 species is the long acuminate point of its leaves. The blades of 



