SYSTEMATIC ANNOTATED LIST OF PLAN'S. 163 
nomenclature is of no great inportance 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. 
SUBKINGDOM PTERIDOPHYTA, FERNS, ETC. 
Family 1. Equisetacee, Scouring Rushes. 
Equisetum arvense L. Field Horsetail. Quite common in 
sandy and clay grounds. Decorah (Goddard), Hesper. 
Equisetwm robustum A. Braun. Great Scouring-rush. Com- 
mon on moist banks, ete. Decorah. 
Equisetum laevigatum A. Br. Prairie Scouring-rush. Quite 
common. Decorah (Goddard). 
Equisetum hyemale L. Scouring-rush. Not common. Cal- 
mar. : 
Family 2. Obphioglossacee. 
Botrychium virginianum (L.) Swz. Moonwort. Not rare 
in deep woods. Hesper, Moneek. 
Family 3, Filicacee. ° 
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. J, 
Onoclea sensibilis L. Oak-leaf Fern. Locally common ‘in 
moist meadows and ravines. Hesper. 
Struthiopteris struthiopteris (L.) (Onoelea 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 rocky banks and ledges. Decorah, Highlandville. 
Phegopteris robertiana (Hoffm.) Fee. (P. calarea Fee.) 
Beech Fern. Rather rare, on shaded rocky banks. Decorah 
(Goddard). i 
