144 JOURNAL OF THE ARNOLD ARBORETUM fvoL. ii 



Magnolia acuminata L. Rather frequent in the Mounds Formation on 

 hillsides and in ravines. It is also found in canyons and at the base of 

 high bluffs in the Ozark Ridge Fornaation, \vhere it is comparatively 

 rare. Seen in Alexander, Pulaski, Union and Johnson Counties. 



Liriodcndron Tulipifcra L. A beautiful and abundant forest tree in 

 the Mounds Formation, and found less frequently on liillsidcs and along 

 bluffs in the Ozark Ridge region. One of the most valuable trees for 

 lumber for which reason most of the larger trees have been cut down, 

 but it is likely to remain a conspicuous feature of the flora in the sec- 

 tions wliere it grows as long as any part of the forest remains. 



Asimina triloba Dunal. A small tree, rarely more than three or four 

 metres tall, in southern Illinois. Commonest in the fertile higher bottoms 

 of the Cairo Formation, but also rather frequent in the Mounds Forma- 

 tion and along rich hillsides in the Ozark region. 



Aristolochia tomcnlosa Sims. Seen only along high banks of the Little 



Wabash River, near New Haven, north of the county line, in White 

 County. 



Brunnichia cirrhosa Gaertn. A tyi)ical plant of the Cairo Formation, 

 where it grows along rich river banks and in open lowlands bordering 

 swamps. 



Clematis virginiaiia L. Abundant in open ground and on borders to 

 swamps in the Cairo Formation. Not noted elsewhere, but likely of 

 be found in suitable situations throughout the region. 



Clematis Simsii Sweet. Rather frequent in rich open ground and 

 along bluffs throughout the region. 



Clematis crispa L. Seen only in rich open lands and wet bottoms of 

 the Cairo Formation, to which it is probably limited, and nowhere very 



common. 



1 



Mcnispcrmum canadcnse L. Occasionally found throughout, on rid 

 banks and along bluffs. 



Coccnlus carolinus (L.) DC. Growing in low rich woods and on open 

 banks of streams, but not very common. 



Cahjcocarpum Lyoni (Pursh) Nutt. Seen only in rich alluvial bottoms 

 along lakes, near Shawneetown, Gallatin County. 



Sassafras officinale Nees & Eberm. More or less connnon throughout 

 in woods and thickets. Most abundant and of the largest size in the 

 Mounds Formation, where it sometimes becomes a tree 8 or 10 metres 

 tall. 



Benzoin acstivale (L.) Nees. Often common in the upper rich bottoms 

 of the Cairo Formation, and almost equally abundant in the Mounds 

 Formation; also sometimes found along streams and on rich hillsides in 

 the Ozark region and northward. 



Philadelphus verrucosus Schrad. Tliis was found growing along the 

 rocky talus below high bluffs of the Ohio River, near Golconda, Pope 

 County. 1 



^ See also p. 153. 



