150 



in the blowsand and Panicuui pseudopubescens associations, and 

 more rarely in open places in the black oak woods. 



Bleocharis ohtusa (Willd.) Sclmltes. In the swamp association 

 in the Dixon and Havana areas. 



StenophyUus capillaris (L. ) Britton. The characteristic species 

 of the StenophyUus association in the bottoms of partially stabilized 

 blowouts in the Hanover, Havana, and Oquawka areas, rarely in the 

 Solidago and bunch-grass associations. 



Scirpus validus Vahl. Around the margin of a pond in a depres- 

 sion between the dunes, Winnebago area. 



Scirpus cyperinus (L.) Kunth. Common in the swamp associa- 

 tion and occasional in the Salix association in the Dixon area. 



Carex festucacea Schkuhr, var. hrevior (Dewey) Fernald. An 

 interstitial in the bunch-grass association in the Hanover and 

 Oquawka areas; not common. 



Car ex MjfJilenbergii Schkuhr. Abundant in the bunch-grass as- 

 sociation in the Hanover, Havana, Dixon, and Oquawka areas, and 

 sometimes becoming the dominant species ; one of the commoner 

 bunch-grass relics in the Panicum pseudopubescens association; in- 

 frequent on the deposits and windward slopes of blowouts; in the 

 black oak association in the Hanover, Winnebago, Havana, and 

 Oquawka areas. 



CarcA' muheUata Schkuhr. Hanover, Havana, and Dixon areas, 

 most abundant in the Panicum pseudopubescens association, persist- 

 ing as a relic on the windward slopes, occasional in the bunch-grass 

 association, and rare on the deposits of blowouts. 



Carex pennsyhanica Lam. Oquawka area, in the bunch-grass 

 association ; Winnebago area, in open places in the black oak asso- 

 ciation. 



Carex sp. Dixon area, in the Solidag^o association. 



Coniuielinaceae 



Commelina mrginica L. Ha\'ana and Ocjuaw^ka areas ; one of 

 the most abundant interstitial species, growing in a wide variety of 

 associations, but probably most abundant on blowout deposits. 



Tradescantia reflexa Raf. Hanover, Kankakee, Winnebago, Am- 

 boy, Havana, and Oquawka areas; common in the bunch-grass and 

 black oak associations and persisting as a relic in the bur oak and 

 Panicum pseu-dopubesccns associations. 



