MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 1 5 



Also collected at the following localities : 

 Alaska: Attu Island, 1891,,/^. J/. Ufacoiin, ij8. 

 Colorado: 1872, C. C. Parr v. 



* Sparganium minimum Fries, Summa Veg. Scand. 68 [Morong, 



Bull. Ton-. Bot. Club, 15 : 80 ; 111. Fl. i : 64]. 



In streams, perhaps ascending a little over 1000 m. in altitude. 



Montana: Columbia Falls, 1892, 7?. S. Williaius, 8gg. 



NAIADACEAE. 



Potamogeton natans L. Sp. PL 126 [Man. R. M. 362 ; Morong, 

 Monograph in Mem. Torr. Bot. Club, 3 : part 2, 13 : 111. Fl. 1: 66; 

 Bot. Cal. 2: 195]. 

 It is reported as growing in Montana, but I have not seen any 



specimens from the state. It is found in the surrounding states. 



Potamogeton alpinus Balbis, Misc. Bot. 13 [Morong, Mon. 19; 111. 



Fl. I : 68] ; Potinnogcton rufcscciis Schrad. ; Cham. Adn. Fl. 



Ber. 4. 1815 [Man. R. M. 362; Bot. Cal. 2: 195]. 



In streams up to an altitude of 2500 m. 



Montana : Madison River, 1886, Tweedy, iio^. 



Yellowstone Park: Clifford Richardson, ace. to Morong; Hot 

 Sulphur Springs, Adams. 



Potamogeton heterophyllus Schreb. Spicil. Fl. Lips. 21 [Morong, 

 Mon. 23 ; 111. Fl. i : 69] ; Potamogeton gramiucus Fries, Novit., 

 Ed. 2, 36 [Man. R. M. 363; Bot. Cal. 2: 196]. 

 It differs from the preceding by its narrower, linear or linear-lan- 

 ceolate submerged leaves. In still and flowing water to an altitude 

 of 2200 m. 



Yellowstone Park: Shoshone Geyser Basin, Clifford Richard- 

 son. 



* Potamogeton heterophyllus graminifolius (Fries) Morong, Mon. 



24 [111. Fl. 1 : 69]; Potamogeton grami)! ens gramimyoIiusYv'iQs, 

 Novit. Ed. 2, 36. 



It is distinguished by its narrow, flaccid submerged leaves. 

 Montana: Whitefish Lake, 1892, R. S. Williams, goo. 

 Yellowstone Park : Shoshone Lake, Aug. 10, 1897, Rxdbergd: 

 Pessev, 372 j: Lake, 1885, Tu'eedy, ^11. 



* Potamogeton praelongus Wulf. in Roem. Arch. 3: 331 [Morong, 



Mon. 32 ; 111. Fl. I : 71 ; Bot. Cal. 2 : 197]. 



