22 H. J. Webber — 
ANTHOPHYTA. 
48. NAIADACEZ. 
116. NAIAS L. Naiad. 
169. N. FLExILIs Rostk. & Schmidt. Stagnant water, Greenwood, 
July (Williams). 
117. RUPPIA L. Ditch grass. 
170. R. occrpENTALIs Watson. In Grand Lake (brackish water) ,. 
abundant. Alliance Aug. 6. This is the form mentioned in the 
Catalogue under Ruppia maritima as probably belonging to the 
foreign variety pedunculata Hart. Mr. Morong writes: ‘‘ There 
can be no doubt that the specimens sent me are &. occidentalis- 
Watson, but with some differences. The leaves are somewhat. 
shorter, the peduncles much longer and the fruit somewhat- 
smaller. This form has not hitherto been found this side of 
Canada.”? (Webber.) 
118. POTAMOGETON UL. Pond weed. 
171. P. aMPLIFoLIUS Tuckerm. Cropsey’s Lake, Lincoln, July (Web- 
ber). 
172. P. FLuITANS Roth. (P. lonchites, Tuckerm.). Streams, etc. An- 
selmo, Custer Co. July (Webber). 
173. P. oAKEsSIANUS Robbins. In pond, Thedford, Thomas Co., July 
11. Arare find. Mr. Morong writes — “ It is the first time I have 
ever known this species to occur so far west. The most westerly 
locality known for it hitherto has been the Adirondack region in 
New York.’’ (Webber.) 
174. P. pectinatTus L. Lakes, etc., abundant. Fremont, July (Will- 
iams). Grand Lake, Alliance, Aug.; Thedford, Thomas Co., 
Aug. (Webber). 
175. P. sprritLus Tuckerm. Lincoln, July (Webber). 
176. P. ZoSTERHFoLIUS Schum. Springy Lakes. Fremont, July; 
Greeley Center, July (Williams). 
49. HYDROCHARIDACEZ. 
119. ELODEA Michx. Water-weed. 
177. EK. CANADENSIS Michx. Margins of Cold Lakes. Fremont, July 
(Williams). 
50. ALISMACEZE. 
120. SAGITTARIA L. Arrow head. 
178. S. CALYcINA Engelm. Moist Banks, Greenwood, July (Will- 
jams). 
179. S. HETEROPHYLLA Pursh. Shallow water and muddy banks. 
Greenwood, July (Williams). 
