22 H. J. Webber — 



ANTHOPHYTA. 



48. NAIADACE.E. 



116. NAIAS L. Naiad. 



169. N. flexilis Rostk. & Schmidt. Stagnant water, Greenwood,,. 

 July (Williams). 



117. KUPPIAL. Ditch grass. 



170. R. occidentals Watson. In Grand Lake (brackish water) , 

 abundant. Alliance Aug. 6. This is the form mentioned in the 

 Catalogue under Buppia maritime/, as probably belonging to the 

 foreign variety pedunculata Hart. Mr. Morong writes: "There 

 can be no doubt that the specimens sent me are B. occidentalism 

 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.) 



US. POTAMOGETON L. 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. oakesianus Robbins. In pond, Thedford, Thomas Co., July 

 11. A rare 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. pectixatus L. Lakes, etc., abundant. Fremont, July (Will- 

 iams). Grand Lake, Alliance, Aug.; Thedford, Thomas Co.,. 

 Aug. (Webber). 



175. P. spirillus Tuckerm. Lincoln, July (Webber). 



176. P. zoster^folius Schuin. Springy Lakes. Fremont, July;: 

 Greeley Center, July (Williams). 



49. HYDROCHARIDACE^. 



119. ELODEA Michx. Water-weed. 



* 



177. E. canadensis Michx. Margins of Cold Lakes. Fremont, July 

 (Williams) . 



50. ALISMACE^. 



120. SAGITTARIA L. Arrow head. 



178. S. calycina Eogelm. Moist Banks, Greenwood, July (Will- 

 iams). 



179. S. heterophylla Pursh. Shallow water and muddy banks. 

 Greenwood, July (Williams). 



