278 DAVENPORT ACADEMY OF SCIENCES. 



1036. E. Canadensis, L., var. glaucij "alius, Gray. 

 With above; infrequent. 



1037. E. striatus, Willd., var. villosus, Gray. 

 Wooded hillsides ; frequent. 



Asprella, Willd. 



1038. A. Hystrix, Willd. Bottle-brush Grass. 

 Moist woods ; frequent. 



EQUISETACE^. 



Equisetum, L. Horse-Tail. Scouring Rush. 

 1036. E. arvensc, L. 



Common in sandy soil. 



1040. E. hyemale, L. Shave Grass. 

 Common in wet soil. 



FILICES. 



Polypodium, L. Polypody. 



1 041. P. vulgare, L. 



Rock ledges, Wild Cat Den. 

 Adiantum, L. Maidenhair. 



1042. A . pedatum , L. 



Shady woods ; frequent. 



Pteris, L. Brake. 



1043. P- aquilina, L. 



Thickets and open woods ; frequent. 

 Pellaea, Link. Cliff Brake. 



1044. P. atropurpurea, Link. 



Limestone ledges; Wyoming Hill, Montpelier, and Devil's 

 Glen. 

 Asplenium, L. Spleenwort. 



1045. A. ebeneum, Ait. 



Open sandy woods ; rare. Muscatine county. 



1046. A. thelyptcroides, Michx. 

 Wild Cat Den. 



1047. A. Filix-foemina, Bernh. 

 Moist woods ; frequent. 



