40 AMERICAN FERN JOURNAL 
Prerce county: Plainview, July 2, 1907, in shallow 
ponds, N. F. Petersen. 
ANTELOPE county: Clearwater, June 16, 1899, re- 
ported as a weed, no. 12036, D. M. Decamp; Brunswick, 
June, 1909, N. F. Petersen. 
SALVINIACEAE 
AZOLLA CAROLINIANA Willd. 
Apparently known from only one or two localities, 
rare. 
THOMAS COUNTY: on ground at edge of water, Dismal 
river, July 12, 1889, no. 6101, H. J. Webber; in a spring 
near Plummer ford, Dismal river, August 24, 1893, 
P. A. Rydberg. 
GARDEN county: Dr. R. J. Pool reports finding this 
species in great abundance along Blue creek in May, 
1912. 
EQUISETACEAE | 
EQUISETUM ARVENSE L. 
Common in sandy soil, fields, pastures, waste places, 
roadsides. The simple fertile stems appearing in March | 
and April and soon withering after fruiting, the branched 
sterile stems come later and persist throughout the sum- 
mer. This species seems to appear mostly as a weed 
and will be found in low wet grounds to rather high and 
dry situations. 
Sarpy county: Bellevue, May 13, 1893, no. 4097, 
Roscoe Pound & DeAlton Saunders. 
SaunDERS county: Ashland, June 24, 1890, Tom A. 
Williams 
Cass county: Weeping Water, reported by Bessey 
& Webber. 
OroE county: Nebraska City, May 28, 1893, no. 
4067, Roscoe Pound & F. E. Clements. 
NemaHa county: Brownville, reported by ages 
& Webber. 
