FLORA OF THE YELLOWSTONE NATIONAL PARK. 67 



Potamogeton perfoliatus, L. 

 With the preceding. 



Potamogeton pectinatus, L. 



Common, especially in the streams of the hot springs and geyser areas. 



Potamogeton pectinatus, L., var. latifolius, Eobbins. 

 With the preceding. 



Triglochin maritimum, L. 



Common in the bogs of the hot springs and geyser areas. 



CYPERACE^. 



Eriophorum russeolum, Fries. 



Bogs about head of Sour Creek, 8500 ft. alt. *'The nearest other 

 known localities are Hudson's Bay and Sitka, Alaska" (Watson), 



Eriophorum polystachyum, L. 



Rather rare in bogs, from 7500-8500 ft. alt. 



Eleocharis acicularis, R. Br. 

 Turbid Lake, 7900 ft. alt. 



Eleocharis palustris, R. Br. 



Rather common in wet jjlaces over the hot spring and geyser areas. 



Eleocharis olivacea, Torr. 



With the preceding, but rather rare. Hot streams, East Fork of the 

 Firehcile River, 8000 ft. alt.; Mud Sprin-s (Adams). 

 Carex scirpoidea, Michx. 



High alpine summits, North Fork of Stinkingwater, 10,700 ft. alt. 



Carex Geyeri, Boott. 



Slough Cretk, G500 ft. alt.; Mirror Lake Plateau, 8500 ft. alt. 



Carex concinna, R. Br. 



Pine woods, Slough Creek, 6500 ft. alt. 



Carex aurea, Nutt. 



Gardiner, 5300 ft. alt.; Firehole River (dulter). 



Carex longirostris, Torr. 



Grassy thickets. Mammoth Hot Springs, 6000 !t. alt. Rare. 



Carex utriculata, Boott, var. minor, Sartwell. 



Common from 7000-8000 ft. alt. Generally in water. 



