267] FLORA OF COLUMBIA AND VICINITY 135 



Quebec and Maine to Michigan and Iowa; Georgia to 

 Arkansas. 



310. Q. acuminata (Michx.) Sarg. [Q.MtMendergii Eag- 

 elm.]. CHESTNxrr oak. 



In rocky woods and along cliffs; common and variable: a 

 shrubby form, bearing acorns when only a few feet high, 

 simulates Q. prinmdes Willd., but neither fruit nor foliage 

 afford characters sufficiently distinct to warrant a definite 

 separation; Gray' remarks that Q. prinmdes Willd. runs into 

 Q. Midilenbergii Engelm. in the far west. 



Vermont to Minnesota; Florida to Texas. 



Order 15. URTICALES. 

 Family 26. ULMACEAE Mirbel. Elm family. 



113. ULMUS L. Elm. 



311. U. fulva Michx. Slippery elm. 

 Hillsides along streams and borders of woods. 

 Quebec to North Dakota; Florida to Texas. 



312. U. racemosa Thomas. Rock elm. 



Rare along the banks of Roche Perche creek, and of a 

 small stream south. 



Quebec to Michigan and Nebraska; New Jersey to Ten- 

 nessee and Missouri. 



313. U. Americana L. Water elm. American elm. 

 Along streams and in alluvial bottoms and swamps, but 



well distributed also in drier situations. 



Newfoundland to Saskatchewan; Florida to Texas. 



114. OELTIS L. Hackberrv. 



314. O. occidentalis L. American nettle-tree. 

 Common both in uplands and along streams. 



Quebec to Manitoba; North Carolina to Louisiana and 

 Kansas. 



1 Manual, 6th ed., p. 476. 



