36 



MISSOURI BOTANICAL GARDEN. 



of the country, and nowhere very abundant in the region 

 east of the Mississippi River, this is the characteristic group 

 of the region west of the Mississippi River from southern 



Missouri to the Gulf. 

 Although Crataegus punctata Jacquin, the type of the 



northeastern sp 

 Illinois, does no 

 well represented 



and 



most widely distributed 



in central and 



the j\Iississippi River, this group is 

 southern part of the state. In ad- 



dition to the eleven species described in 

 evidences that several other Punctatae 



found 



the southeastern counties, 



perhap; 



in 

 col- 



Una Chapm 



Group, the best represented 



Crus 



« • 



southern Ar- 



kansas, western Louisiana and eastern Texas, Crataegus 

 viridis Linnaeus is one of the four species of wide distribu- 

 tion which reaches Missouri. Five other species of this group 



described 



bottoms in Illinois, and four have not been seen beyo 



boundaries 



in this paper are found only on the Mississippi 



and 



( 



distributed 



Missouri by sixteen species, and appears to be pretty gener- 

 ally distributed over the state, at least in that part of it 

 south of the Missouri River. 



Of 



groups 



in the northeastern part of the country, no representative 



has been found 



Missouri, although many Teiiuifoliae 



occur 



in northern Illinois. The Flabellatae, too, which 

 abound in the region extending from New England through 

 New York, Ontario and southern Michigan to northern 

 Illinois, where they often grow to a large size, appear to be 



and probably 



Mississippi River. 



In the 



Group, which is very 



distributed 



from the St. Lawrence River valley and eastern New Eng- 

 land to eastern Nebraska and Kansas, eleven species are 

 here described. In the eastern states many of the species in 



