138 JOURNAL OF THE ARNOLD ARBORETUM [vol. ii 



situations, but this is partly due to the long-continued pasturing of the 

 fenced woodlands; and on steep hillsides and in other more protected 



(fidulum, Smilax rotundifulia and Vitis cordifol 



trif, 



thickets, while in more open situations little groups or copses of Prunus 

 americana, Crataegus phaenupyrum and Aralia spinosa occur. Tlie Black 

 Locust appears to be indigenous in the Shawneetown Hills; Linden {Tilia 

 glabra) \s occasionally found on banks of small streams, and Rhamnus 

 caroUniana collected here was seen nowhere else in southern Illinois. 

 B<>cch is found along steep hillsides and in deep ravines, but is not so 

 common as southward, and the Cucumber Tree was not observed. 



LIST OF LIGNEOUS PLANTS COLLECTED IN SOUTHERN ILLINOIS 



rinus echinata Mill. Found only on high cherty hills in Union County. 

 Very local and likely to be exterminated. 



Taxodium distichuvi (L.) Richard. P'ornierly quite abundant in swamps 

 and sloughs south of the Ozark Ridge, and along the Ohio River to the 

 mouth of the Wabash and beyond. Strictly confined to swamps and 

 lake margins, and its range now very much restricted by drainage and 

 cutting for commercial use. For these reasons it is likely to become 

 conii)aratively scarce, but hardly extinct in the region for many years. 

 Observed in Alexander, Union, Pulaski, Johnson, Massac, Gallatin and 

 Saline Counties. 



Juniper us virgin iana L. Rather common but usually of small 

 tliroughout the Ozark Ridge region and rarely on low hills of the Mounds 

 Formation. Ai)parently most abundant in Union, Johnson and Pope 

 Counties, where a considerable quantity is cut for fence posts and occa- 

 sionally for i)oles used in construction of local telephone lines. 



Arundinaria macrospcrma Michx. Common in low open bottoms and 

 along banks of small streams, lakes and borders of swamps throughout 

 the Cairo Formation; more local along rich banks in the Mounds and 

 Ozark Ridge Formations. Most abundant and of the largest size near 

 Cairo, where it someliiues forms small thickets, growing to a heiglit of 

 one to two metres, and with stem diameter rarely up to three or four 

 centimetres. Observed in Alexander, Union, Pulaski, Massac, Johnson, 

 Pope, Hardin, Gallatin, White, Wabasli and Richland Counties. 



Smilax rotundifulia L. Not unconunon in l)ottoms and along streams, 

 apparently througliout the region. 



Smilax glauca Walt. Rather uncommon and apparently restricted to 

 the lowlands of the Cairo Formation, although likely to be found along 

 streams penetrating the hills. Usually of small size. 



Smilax Bona-nux L. Apparently restricted to the Ozark Ridge For- 

 mation, where it is a common species in old fields and on eroded hill- 

 sides. In such situations it is usually low and trailing and seldom pro- 

 duces fruit. It is occasionally found trailing over low bushes, producing 

 canes several metres long and with abundant fruit. 



