Celtis 



Ulmaceae 



393 



50 



Map 805 



pumila (Muhl) Pursh 



o 50 



Map 806 



Morus rubra L. 



HACKBERRY. Map 802. This tree is no doubt found in every county of 

 the state. It prefers the moist, alluvial soil along streams but is some- 

 times found in sandy upland and on wooded slopes. It is rare in northern 

 and southern Indiana but frequent along our major streams. It is infre- 

 quent to rare in low woods at a distance from a stream. This is the com- 

 mon hackberry in the state. 



Que. to N. Dak., southw. to Mass., N. Y., Ga., and Okla. 



la. Celtis occidentalis var. crassifolia (Lam.) Gray. (Celtis crassifolia 

 Lam.) Bigleaf Hackberry. Map 803. This form is found probably 

 throughout the state with the preceding but is rare or infrequent. I am 

 not convinced that this variety has any standing. I have found both 

 smooth and rough leaf forms on the same tree. Undoubtedly mere 

 roughness of leaves has little significance. 



Va. and Ind. to Minn, and Wyo., southw. to N. C. and Tex. 



2. Celtis laevigata Willd. (Celtis mississippiensis Bosc of Gray, Man., 

 ed. 7 and Britton and Brown, Illus. Flora, ed. 2.) Sugarberry. Map 804. 

 Infrequent to rare or locally common in low woods in the southwestern 

 part of the state. It is usually found in low woodlands, especially those 

 that are more or less inundated. It is abundant in the bottoms along the 

 Wabash River and frequent in the bottoms near the mouth of Little 

 Pigeon Creek. It no doubt formerly followed the larger streams farther 

 northward than our map indicates. It prefers a hard soil and is rarely 

 found in a porous, alluvial soil. The leaves of this species are usually 

 almost uniform but variations are found. A mile and a half northwest of 

 Griffin, Posey County, I found a large tree that had small leaves, in size and 

 shape like those of the next species but here and there among the leaves 

 were typical ones. The location of the typical leaves indicated to me that 

 the dwarfing was a matter of nutrition but in this I may be in error. 

 The typical leaves are thin and not at all coriaceous but sometimes the 

 leaves are more or less coriaceous. The thickening of the leaves may be due 



