19211 PALMER. BOTANICAL RECONNAISSANCE OF SOUTHERN ILLINOIS 151 



Cornus asperifolia Michx. Found more or less abundantly in all parts 

 of the region. Perhaps commonest in open woods of the Mounds For- 

 mation. 



Cornus strida Lam. A common species in swamps and low wet woods 



of the Cairo Formation; and also very abundant along small sluggish 

 streams, on poorly drained prairies in Richland County. 



Cornus racemosa Lam. Growing with the last in swamps and low 

 woods of the Cairo Formation, but less common. 



Nyssa sylvatica Marsh. A rather common forest tree throughout. In 

 the Cairo Formation it grows in the low wet bottoms and sometimes 

 in swamps, as well as in the better drained lands. It is commonest and 

 of the largest size in the Mounds Formation, and is also found in the 

 more fertile lands of the Ozark region. 



Nyssa aqiiatica L. This is one of the typical trees of the Cairo For- 

 mation, and is found only in the deeper permanent swamps, where it 

 is often associated with the Cypress; however, it does not extend so far 

 north as the latter, not being found north of the Ozark Ridge in Illinois. 

 It was observed in Alexander, Pulaski, Massac, Johnson and Pope Coun- 

 ties, 



Vaccinium arboreum Marsh. Found only in the Ozark Ridge region, 



where it grows along the edges of bluffs or in dry rocky woods. Seen 

 in Union, Johnson, Pope and Hardin Counties. 



Vaccinium arboreum var, glaiicescens Sarg. Growing with the preced- 

 ing species a^ong the margins of rocky bluffs in Johnson and Pope 

 Counties, but less abundant than the last. 



Vaccinium virgaium var. tenellum (Ait.) Gray. Restricted to a few 

 localities in the Ozark Ridge region. Observed only in Union and John- 

 son Counties, but reported by country people in Hardin County, where 



it probably grows. 



Rhododendron roseum Rehd. Seen only in the Pine Hills locality of 

 Union County, where it grows abundantly along rocky bluffs and steep 



chcrty hillsides. 



Trachelospermum diform.e (Walt.) Gray. A typical plant of the Cairo 



Formation, where it grows sparingly on open river banks and margins 



of swamps. 



Bumelia lycioides (L.) Pers. Grows sparingly on knolls in low woods 

 of the Cairo Formation, and along rocky bluffs and hillsides in the Hmc- 

 stone section of the eastern Ozark Ridge. Seen in Pulaski, Pope and 



Hardin Counties. 



Diospyros virginiana L. More or less abundant throughout the region, 



usually growing on open uplands or margins of woods. 



Styrax americana Lam. Strictly local in deep swamps of the Cairo 

 Formation. Observed in Alexander, Pulaski, Massac and Johnson Coun- 

 ties. 



Fraxinus americana L. Found throughout the region; usually growing 



in upland forests, but sometimes in low ground. 



