66 FLORA OF THE YELLOWSTONE NATIONAL PAUK. 



Juncus Nevadensis, Wats. 



Mammoth Hot Springs, 6400 ft. alt. 



Juncus xiphioides, ^Meyer, var. montanus, Engeliu. 

 Common throughout np to 8000 ft. alt. 



TYPHACE^. 



Typha latifolia, L. 



Head of Yellowstone Lake (Parry). 



Sparganium simplex, Hudson, var. angustifolium, Engelm. 

 Ponds and streams throughout up to 8000 ft. alt. 



LEMNACEJE. 



Lemna trisulca, L. 



Ponds and streams throughout, up to 8000 ft. alt. Very common in 

 the Geyser Basins. 



Lemna minor, L. 



With the preceding. 



Lemna gibba, L. 



Ponds, head of Broad Creek, 8500 ft. alt. 



ALISMA.CEJE. 



Sagittaria variabilis, Engelm. 



Gibbon Lakes, 8000 ft. alt.; Yellowstone Lake ; Lewis Lake. Rather 

 common, but rarely flowering. 



NAIADACEJE. 



Zanichellia palustris, L. 



Yellowstone Lake (Parry— Adams). 



Ruppia maritima, L. 



Common in the sluggish streams and waterholes of the hot springs 

 and geyser areas. 



Potamogeton rufescens, Schrad. 



Hot Sulphur Springs (Adams). 



Potamogeton gramineus, L., var. maximus, L. 



Ponds and streams throughout, up to 8000 ft. alt. 



