IOWA ACADEMY OF SCIENCP:S. 167 



leaf surface or the leaves roll in when the transpiration 

 is too great. Of these we may enumerate: 



Sporobolus cuspidatus . Stipa spartea. 



Calantovitfa longifolia. Poa compressa. 



And> opogon scoparius. Poa pratensis . 



Bouteloua racetnosa . Agropyron occidenlale . 



Bouteloiia oLigoslachya. E/ymas Canadensis. 



It must not be assumed that hydrophytic and mesophytic 

 plants are wanting, they are numerous as the writer's list* 

 indicates. Such species as Leersia otyzoides,, and Leersia 

 Yirgiuicaj Ultricularia vulgaris, Potamorjeton, Sag'dtaria, 

 Ranuneulu!^ viulfifidiis are well known representatives of 

 stagnant pools and slow running streams. Cijstopteris 

 fragilis, Festucu nutans, Bromus purgans, Eupatorium ager- 

 atoides are well known mesophytic representatives of 

 woods. 



PLANT FORMATIONS. 



In this paper I have adopted the excellent classification 

 of Cowdesf as well as some valuable suggestions from the 

 paper by Pound and Clements.:]: 



In the paj)er by Cowles two general groups are made. 



I. Inland group: 



1. River. 



2. Swamp. 



3. Upland. 



II. Coastal: 



1. Lake bluff. 



2. Dune. 



The Pounds and Clements Classification for Nebraska is 

 as follows: 



I. Wooded— bluff and meadow land region. 



II. Prairie region. 



III. Sandhill region. 



IV. Foothill region. 



The region considered in this paper would be embraced 

 in the wooded bluff and meadow land region. 



*L. H. Pammel. Notes on the Flora of Western Iowa. Proc. lo. Acad, of Sci. 3: 

 106-135. Contr. Bot. Dept. lo. Coll. Agrl. and Mech. Arts. 1. 



+ Bot. Gazette 31: 73, 145. 



X The Phytogeography of Nebraska. Cxeneral Survey. Univ. Neb. Bot. Survey of 

 Neb. 1. 



