14 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Montana: Jack Creek, Jul}- 15, 1897, I^ydbcrg cf- Bcsscy, 3^4.2 : 

 Belt Canon, 1886, R. S. Williams, 732; Helena, 1892, Kchcy ; 

 Bozeman, W. T. Shaw. 



Yellowstone Park : Lone Star Geyser, Rydbcrg tC- Bessey, 



354-3- 



Idaho: Henry's Lake, 1892, /^c/Zt/ J/// /A>r<:/. 



MONOCOTYLEDONES. 



TYPHACEAE. 



Typha latifolia L. Sp. PL 971 [Man. R. M. 359: 111. Fl. i : 62 ; 

 Bot. Cal. 2: 188]. 



In swamps and slow running streams, to an altitude of 1000 m. 

 Montana: Helena, 1892, Kehcy. 

 Yellowstone Park : Head of Yellowstone Lake, Parry. 



SPARGANIACEAE. 



Sparganium eurycarpum Engelm. in Gray, Man. Ed. 2, 430 [Man. 

 R. M. 359; Morong, Bull. Torr. Bot. Club, 15: 76; 111. Fl. i: 

 6-^', Bot. Cal. 2: 188]. 



In swamps, at an altitude of less than 1500 m. 

 Montana: Manhattan, 1895, Rydbcrg. 



* Sparganium simplex multipedunculatum Morong, Bull. Torr. Bot. 



Club, 15: 79. 



It differs from the type in having a more branched inflorescence 

 with some of the lower heads peduncled. In swamps and lakes at 

 an altitude of 1-2000 m. 



Montana: Belt Creek, 1887, R. S. Williams, ^gy ; Meadow 

 Creek, 1886, F. Tweedy, logy. 



* Sparganium natans L. Sp. PI. 971. 



This species differs from S. simplex in the leaves, which are 

 longer, floating and not at all triangular at the base. It has gen- 

 erally been confused with S. si)iiplcx angustifolium (Michx.) 

 Engelm. It is a boreal plant and not found in the United States ex- 

 cept in the mountain regions, where it extends south to Colorado. 

 In the Yellowstone Park, it grows at an altitude of about 2000 m. 



Yelloavstone Park: Shoshone Lake, Aug. 10, 1897, Rydberg 

 <£- Bessey, 372J ; Gibbon River, 1884, Tztredv. 



