NOTES ON THE FLORA OF IOWA. 213 



Trillium nivale Rid. 



Henry Co. [Mills) ; Chickasaw Co. [Miss Howe) ; Linn 

 and Johnson Cos. Common. A form with pink-veined 

 petals is common near Iowa City. 

 Melanthium virginicum L. 



Lee and Johnson Cos. Formerly rather common in John- 

 son Co., but now very rare. 



PTERIDOPHYTA. 



Equisetum arvense L. 



Emmet Co. [Cratty); Henry Co. [Mills); Lee, Johnson, 

 Linn and Winnebago Cos. 

 Equisetum limosUxM Z. 



Emmet Co. [Orally); Delaware Co. [Macbride) ; Hamil- 

 ton Co. 

 Equisetum hyem.vle Z. 



Lee, Johnson, Linn and Winnebago Cos. 

 Equisetum l^evigatum Bratin. 



Emmet Co. [Cratly); Shelby Co. [Fitz pat rick) ; Page Co. 



POLYPODIUM VULGARE Z. 



Allamakee, Muscatine and Clayton Cos. [Macbride ) 

 Pteris aquilina Z. 



Johnson Co. 

 Adiantum pedatum Z. 



Jones and Allamakee Cos. ( Macbride) ; Emmet Co. ( Cratty) ; 

 Shelby Co. [Fit zpat rick) ; Calhoun Co. [Rigg); Polk 

 Co. [E. Des Moines H. S.); Lee and Johnson Cos. 

 Pell^ea gracilis Hook. 



Cedar and Delaware Cos. [Macbride); Dubuque Co. [F 

 M. Irish); Johnson Co. [Dr. C. M. Hobby) ; Johnson 

 and Jackson Cos. This species was collected in Scott 

 Co. by Dr. Parry in i860, but has not been found there 

 since. 

 Pell^ea atropurpurea Link. 



Jones Co. [Macbride) ; Johnson Co. Common. 



