1921] PALMER. BOTANICAL RECONNAISSANCE OF SOUTHERN ILLINOIS 139 



Smilax hispida Muhl. Rather common In thickets and along small 

 streams, apparently throughout. 



Smilax pseudo-china L. Found in the Wabash Valley, where It is 

 a common species in thickets and along fence rows. — A vigorous grow- 

 ing Smilax with thorny-hispid canes and broad-oval leaves up to 1.5 

 or 2 decimetres in diameter was collected, under number 15543, in low 

 overflow bottoms of the Wabash River near New Haven. Dr. Ridgway 

 has apparently found the same thing in Richland County. 



Salix nigra Marsh. Common In low bottoms and on alluvial banks 

 of streams and lakes throughout. Most abundant and of the largest 



size in the Cairo Formation. 



Salix amygdaloides Anders. Locally abundant on low alluvial banks 

 of the Mississippi River near East Cape Girardeau, Alexander County, 

 and more rarely southward along the same stream to the vicinity of 

 Cairo. A medium-sized tree, sometimes 10 or 12 metres tall. 



Salix longifolia Muhl. Very common in low alluvial bottoms and on 

 sand-bars and low banks of streams in the Cairo Formation; often form- 

 ing extensive thickets with a very dense cane-like growth along newly- 

 made mud-flats and sand-bars of the Mississippi and Ohio Rivers; less 

 common but not rare along streams and in low ground throughout the 

 region. Usually a shrub from one to three metres tall; rarely a small 

 tree six to ten metres tall, with rough bark and erect branches. 



Salix cordata? Muhl. A shrub or small tree, apparently an undeter- 

 mined variety of this species occurs in the Cairo Formation. (Appar- 

 ently no collection of this was made in Illinois, but it is represented by 



number 16369, Poplar Blufi", Mo.) 



Salix cordata var. myricoides (Muhl.) Carey. A straggling shrub 3 

 to 5 metres high, with greenish, or on old stems gray, bark, and pubescent 

 branchlets and leaves pubescent below. In open situations, alluvial banks 

 and margins of swamps in the Cairo Formation. 



Salix Imviilis Marsh. Uncommon along open rocky banks in the 

 Ozark region; more abundant northward. 



Salix hvmilis var. rigiduscula Anders. A straggUng shrub, up to 2 or 

 3 metres tall, on flat wet prairies in Richland County. Not seen elsewhere. 



Salix sericea Marsh. A tall shrub in open swamps of the Cairo Forma- 

 tion, and also collected along rocky (sandstone) beds of streams in John- 

 son County. 



Salix pcdicellaris Pursh. A spreading shrub 3 or 4 metres tall, on 

 open banks of railway cut near Norrls City, White County. Not seen 



elsewhere. 



Populus heterophylla L. Common in swamps and along low margms 

 of lakes in the Cairo Formation and northward along the Wabash. 



Populus balsamifera L. Not uncommon, on alluvial banks of streams 



and in open bottoms throughout. 



Jiiglans cinerea L. Fre(iuent along bluffs and rich hillsides, especially 



in the Mounds Formation. 



