Ulmus 



Ulmaceae 



391 



50 



Map 798 

 Ulmus fulva Michx. 



50 



Map 799 



Ulmus racemosa Thomas 



' 50 



Map 800 



Ulmus alata Michx 



been heavily cut over and left for a second crop this species is usually 

 well represented, sometimes forming the major stand. The inner bark 

 was formerly chewed as a remedy for stomach trouble and used in medicine 

 in powdered form for poultices. 



Western Que. and w. N. E. to N. Dak., southw. to Fla. and Tex. 



2. Ulmus racemosa Thomas. (Ulmus Thomasi Sarg.) Map 799. Rock 

 Elm. Infrequent to frequent or rare within the area shown on the map, 

 to which should be added Floyd, Monroe, and St. Joseph Counties. This 

 species is found in a habitat a little drier than that of the American elm 

 and usually in a more moist habitat than that of the slippery elm. It 

 is almost always associated with the American elm and is difficult to dis- 

 tinguish from it when only the trunk and base are available as char- 

 acters for separation. The American elm usually has a more buttressed 

 base than the rock elm. 



Western Que. and w. Vt. to Ont. and Minn., southw. to n. N. J., Ky., 

 and Mo. 



3. Ulmus alata Michx. Winged Elm. Map 800. Probably restricted 

 to the area shown on the map. This species has two rather distinct habitats. 

 In the hilly counties it is found on the sides of cliffs, on steep rocky slopes, 

 and on the crests of high ridges. It is usually found on or near sand- 

 stone and generally associated with American chestnut and black, chest- 

 nut, and scarlet oaks. In this habitat it is usually a scrubby or small tree 

 with the corky excrescence on the branches well developed. The other 

 habitat is in hard, white clay flats of the southwestern counties where 

 it is associated mostly with sweet and black gum and pin oak. In the 

 "flats" it sometimes reaches a large size. Rarely specimens are seen which 

 have few or no corky excrescences. 



Va. to Kans., southw. to Fla. and Tex. 



4. Ulmus americana L. AMERICAN Elm. Map 801. Found in every 

 county of the state. It prefers a moist or wet soil and is frequent to com- 



