PLANTS OF IOWA 91 



XANTHIDIUM, Ehrb. 



1115. X. antilopceum, Kuetz. 

 Slough. 



ARTHRODESMUS, Ehrb. 



1116. A. incus, (Breb.) Hass. 

 Slough. 



EUASTRUM, Ehrb. 



1117. E. Unale, (Turp.) Ralfs. 

 Slough. 



MlCRASTERIAS, Ag. 



1118. M. truncata, (Corda.) Breb. 

 Slough. 



STAURASTRUM, Meyen. 



1119. 8. pygmceum, Breb. 

 Slough, amid Utricularia. 



1120. S. margariaceum, Menegh. 

 Slough. 



1121. S. Polymorphism, Breb. 



Slough, amid Utricularia, or decaying rushes. 



1122. S. crenulatum, (Depl.) Naeg. 

 Slough, amid Utricularia. 



VAUCHERIACE^E FAMILY. 

 VAUCHERIA, DC. 



1123. V. aversa, Hass. 

 River bank. 



1124. V. sericea, Lyngb. 



In water, or wet places. 



1125. V. dillwynii, Ag. 



On damp, or wet ground, in shaded places. 



1126. y. sellilis, DC. 

 On damp soil. 



1127. y. geminata, DC. 

 Not common. 



1128. V. germinata, var. racemosa, Walz. 

 In stagnant water. 



