FLORA OF THE YELLOWSTONE NATIONAL PARK. 63 



Salix reticulata, L. 



With the preceding, but more common. 



Populus tremuloides, Michx. 



Along streams and in small groves over moist slopes, up to 8000 ft. alt. 



Populus angustifolia, James. 



Cache Creek, 7000 ft. alt. Rare. 



ORCHIDACEJE. 



Corallorhiza multiflora, Nutt. 

 Shoshone Lake (Coulter). 



Corallorhiza innata, R. Br. 



Moist woods, rather common. Swan Lake, 7400 ft. alt.; Gibbon 

 Meadows, 7400 ft. alt.; Lewis Lake, 7600 ft. alt. 



Habenaria Unalaschensis, Wats. 



Mammoth Hot Springs, 6500 ft. alt.; Cache Creek, 7200 ft. alt. In 

 moist woods, rare. 



Habenaria hyperborea, R. Br. 



Open and wooded bogs, from 7500-8500 ft. alt. Common. 



Habenaria dilatata, Gray. 

 With the preceding. 



Habenaria obtusata, Richardson. 



Mossy woods, Soda Butte Creek, 7200 ft. alt., with Liatera. 

 Spirantb.es Romanzoffiana, Cham. 



Bogs and moist meadows throughout, up to 8500 ft. alt. 

 Listera convallarioides, Nutt. 



Mossy pine woods, Soda Butte Creek, 7200 ft. alt. Rare. 

 Listera oordata, R. Br. 



With the preceding and more common. Gibbon Meadows, 7400 ft alt. 



IRIDACEJE. 



Iris Missouriensis, Nutt. 



Rescue Creek, Mt. Evarts, 7000 ft. alt. Rare. 

 Sisyrinchium mucronatum, Michx. 



Mammoth Hot Springs, 6200 ft. alt.; Pelican Creek, 8200 ft. alt.; Up- 

 per Yellowstone Falls (Adams). 



