SYSTEMATIC ANNOTATED LIST OF PLANTS. 163 



nomenclature is of no great iuportance in a mere geographical 

 list. Gray's Manual is still widely used in this state, and the 

 earlier plant lists published by the Survey were based on it. 

 For that reason, in cases in which the name here adopted dif- 

 fers from that of the Manual, the latter follows in parenthesis.- 



SUBKINGD0M PTERIDOPHYTA, FERNS, ETC. 



Family I. Equisetacete . Scouring Rushes. 



Equisetum arvense L. Field Horsetail. Quite common in 

 sandy and clay grounds. Decorah (Goddard), Hesper. 



Equisetum robustum A. Braun. Great Scouring-rush. Com- 

 mon on moist banks, etc. Decorah. 



Equisetum laevigatum A. Br. Prairie Scouring-rush. Quite 

 common. Decorah (Goddard). 



Equisetum hyemale L. Scouring-rush. Not common. Cal- 

 mar. 



Family 2 . Ophioglossacecz . 



Botrychium virginianum (L.) Swz. Moonwort. Not rare 

 in deep woods. Hesper, Moneek. 



Family 3. Filicac«z . 



Osmunda claytoniana L. Flowering-fern. Common in deep 

 woods. Moneek, Decorah, Hesper. 



Polypodium vulgare L. Polypody. Rather rare, on moss- 

 covered ledges along Canoe creek. 



Woodsia ilvensis (L.) A. Br. Rare, in crevices of St. Peter 

 sandstone near Hesper. 



Onoclea sensibilis L. Oak-leaf Fern. Locally common in 

 moist meadows and ravines. Hesper. 



Struthiopteris struthiopteris (L.) (Onoclea strythiopteris 

 Hoffm.) Ostrich fern. Locally abundant on alluvial grounds. 

 Along Bear and Canoe creeks. 



Cystopteris fragilis (L.) Bernh. Bladder-fern. Quite com- 

 mon in rich woods. Decorah. 



Cystopteris bulbifera (L.) Bernh. Bulb-bearing Fern. Very 

 common on reeky banks and ledges. Decorah, Highlandville. 



Phegopteris robertiana (Hoffm.) Fee. (P. calarea Fee.) 

 Beech Fern. Rather rare, on shaded rocky banks. Decorah 

 (Goddard). 



