H8 JOURNAL OF THE ARNOLD ARBORETUM (vol. ii 



C)/mnocladus dioica (L.) Koch. Found occasionally throughout the 

 region. In the Cairo Formation it occurs rarely on well-drained river 

 banks and in the upper alluvial bottoms; in the Ozark Ridge Formation 

 it is sometimes found along rocky bluffs, but is not common. Most 

 abundant on steep hillsides of the Mounds Formation. 



Clledif^'ia triacanthos L. Rather frequent in moist ground and low 

 woods througliout the region. 



Gleditsia aqualica Marsh, Locally abundant in swamps of the Cairo 

 Formation, extending northward in swamps along the Ohio and Wabash 

 Rivers. Near Cairo a form was found having two seeds in each pod. 

 Noted in Alexander, Pulaski and Gallatin Counties, and reported as far 

 north as White County. 



Ccrcis canadensis L, More or less abundant throughout the region. 

 Commonest and of the largest size in the Mounds Formation. 



Rohinia Pscudoacacia L. Apparently native along the Ohio River, 

 norfli of the Ozark Ridge, and in the Shawneetown Hills of Gallatin 

 County. Adventivc elsewhere, and often common in the Cairo region, 

 along levees and banks of streams. 



Amorpha frnhcosa L. Common in low and swampy ground through- 

 out the region. 



Wistaria macrostachja Nutt. Seen only in the Cairo region, where it 



grows sparmgly in rich open woods and along borders of swamps and 



streams; but reported from Richland and Wabash Counties by Dr. Ridg- 

 way. 



Zanthoxylum americamnn Mill. Uncommon in thickets and open hill- 

 sides in the Ozark Ridge region and northward. 



Ptelea irijoliaia L. Seen only along rocky banks of the Ohio River, 

 near Golconda, Pope County. 



Rhus glabra L. More or less common throughout, in thickets and 

 open ground. 



Rhus copallina L. In similar situations to the last and about as com- 

 mon. 



Rhus Toxicodendron L. Rather common in woods and along rocky 

 banks and bluffs in all parts of the region. 



Rhus canadensis Marsli. Seen only in the Ozark Ridge region, where 

 it is comi)aratively rare. Noted in Union and Johnson Counties, 



Ilex decidua Walt. In low woods and swamps of the Cairo Formation, 



where it is rather common and of large size. It also occurs less commonly 



along streams in the Mounds and Ozark Ridge Formations and north- 

 ward. 



Ilex verhcillaia (L.) Gray. Apparently rare along rocky streams in 

 the Ozark Ridge. Seen only at two stations in Johnson County. 



Eronymus atropurpurcus Jacq. Occasionally found in rich woods and 

 along banks and bluffs in all parts of the region. 



Eronymus obovatus Nutt. Rather rare, in rich woods bordering swamps 

 in the Cairo and Mounds Formations and north of the Ozark Ridge. 



