PLANTS NEW TO THE FLORA OF DECATUR COUNTY, 
IOWA. 
BY J. P. ANDERSON. 
In this paper it is the intention of the writer to enumer- 
ate only such species as have not before been reported from 
the above named county in any of the papers presented to 
this Academy. Duplications may occur but we have tried 
to avoid them. This list brinpjs the total of the flowering 
plants reported from this one county up to about 628. 
Work done on other groups is not now in proper shape for 
presentation . Great care has been exercised in the deter- 
mination of species and several species have been omitted 
from this list because of some doubt as to the accuracy of 
the determination. The nomenclature here used is that 
of Britton and Brown’s Illustrated Flora. 
SPARGANIACE^. 
Sparganium eurycarpum Engelm. Broad-fruited Bur-reed. 
Occurs along the edges of a pond near Grand river. 
NAIADACE^. 
Potamogeton pusillus L. Small Pondweed. Abundant in 
some ponds east of Davis City. I have also found it near 
Lamoni. June 23, 1900. 
Potamogeton lonchites Tuckerm. Long-fruited Pondweed. In 
a pond near the Weldon river. July 28, 1900. 
ALISMACE^. 
Sagittaria rigida Pursh. Sessile-fruiting Arrowhead. In 
ponds near the Grand River. July 24, 1899. 
Sagittaria graminea Michx. Grass -leaved Sagittaria. In 
some railroad ponds near Davis City. August 13, 1903. 
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