FLORA OF THE YELLOWSTONE NATIONAL PARK. 61 



Polygonum polygaloides, Meisner. 



Blacktail Deer Creek, 7200 ft. alt. 



Polygonum amphibium, L. 



Common in ponds about Yellowstone Lake. Bioad Creek, 8300 ft. alt. 



Polygonum Muhlenbergii, Wats. 

 Red Mountain (Coulter). 



Folygonum Bistorta, L. 



Bogs and meadows, 7500-9500 ft. alt. Extremely common in subal- 

 pine meadows. The common form is var. linearifolium, Wats. 



Polygonum viviparum, L. 



With the preceding, but much less common. Indian Creek, 8000 ft. 

 alt.; Cache Creek, 7400 ft. alt.; Firehole River (Coulter); Yellowstone 

 Falls (Adams). 



EL^IAGNACE^J. 



Elseagnus argentea, Pursh. 



Mammoth Hot Springs. Rare. 



Shepherdia Canadensis, Nutt. 



Bell Peak, 8400 ft. alt.; Cache Creek, 7600 ft. alt. Yellowstone Lake 

 (Adams). 



LORANTHACEJE. 



Arceuthobium Americanum, Nutt. 

 Common on Pinus Murray ana. 



SANTALACEJE. 



Comandra pallida, A. DC. 



Dry banks, common up to 8000 ft. alt. 



EUPHORBIACEJE. 



Euphorbia serpyllifolia, Pers. 



Common on the formation of the Geyser Basins. 



Euphorbia glyptosperma, Engelin. 

 Yellowstone Lake (Adams). 



Euphorbia dictyosperma, Fisch. & Meyer. 

 Yellowstone (Forwood). 



