BULLETIN OF THE UNITED STATES FISH COMMISSION. 263 



108. Potamogeton pulcher, Tuckermau. Eastern Massachusetts, Missouri, 



Georgia. 



109. Potamogeton pusillus, L. Very common, especially southward. 



110. Potamogeton Robbinsii, Oakes. New England, New York, Pennsyl- 



vania, and Ohio. 



111. Potamogeton rufescens, Sckrad. New England to Pennsylvania, 



Illinois, and especially northward. 



112. Potamogeton spirillus, Tuckerman. Maine to Lake Superior and 



Virginia. 



113. Potamogeton Tuckermani, Robbins. White Mountains, New Hamp- 



shire, to Pennsylvania. 



114. Potamogeton Vaseyi, Eobbins. Illinois, Massachusetts. 



ALISMACE^E. 

 Water -Plantain Family. 



115. Scheuchzeria palustris, L. New England to Pennsylvania, Illinois, 



and northward. 



116. Alisma plantago, L., var. Americanum, Gray. 



117. Echinodorus parvulus, Engelm. Massachusetts and Michigan to 



Illinois. 



118. Echinodorus rostratus', Engelm. Illinois and southward. 



119. Ecliinodorus radicans, Engelm. Illinois and southward. 



120. Sagittaria lancifolia, L. Arrowhead. Virginia, and southward to 



the West Indies. 



121. Sagittaria variabilis, Engelm. New Jersey and southward. 



122. Sagittaria calcyna, Engelm. Maine to Delaware, Wisconsin, and 



southward. 



123. Sagittaria heterophylla, Pursh. 



124. Sagittaria graminea, Michx. Eather common, especially southward. 



125. Sagittaria piisilla, Nutt. From Eastern New Jersey and Philadel- 



phia southward, near the coast. 



12G. Sagittaria natans, Michx. 



HYDROCHARIDACE^. 

 Frog's-bit Family. 



127. Limnobium Spongia, Richard. A merican frog's-bit. Lake Ontario, 



Illinois, and in the Southern States. 



PONTEDERIACEtE. 



plckerel-weed family. 



128. Pontederia cordata, L. Pickerel- weed. Common. 



129. ReterantJiera reniformis, Ruiz, and Pav. Mud Plantain. 



130. Heteranthera limosa, Vahl. West Virginia to Illinois and south- 



ward. 



