THE AMERICAN BOTANIST 45 



throughout most of the United States and very abundant in 

 Moenkopi. 



Scirpiis Americaniis Pers. Three-square. Another 

 widely distributed plant plentiful in wet places. 80 



Scirpus occidentalis (Wats.) Bull-rush. This giant 

 rush is similar in appearance to the lake rush {S. lacustris) of 

 which it is sometimes regarded as a variety. Characteristic 

 colonies are found in several of the reservoirs. Cattle are 

 fond of it and w-ade into the water for it. 128 

 J uncus Torreyi Coville. Plentiful in dryish soil. 67 



Junciis Mexicanus VVilld. In rather dryish places abund- 

 ant. 65 



Yucca spF Two kinds of yucca are abundant in the desert 

 and may be fouryd in the oasis. They were in full fruit in 1919 

 but for some reason failed to fruit in 1920 and could not be 

 identified. The yucca seems destined soon to disappear since 

 the immature plants are eaten by sheep and goats. 



Serapis gigantea (Dougl.) HellEborine. Apparently 

 the only orchid in the oasis. A considerable colony was found 

 about the large reservoir at Tuba. 83 



Salsola pestifer A. Nels. Russian thistle. This well 

 known plant is very abundant in the desert, often in pure sand, 

 and is equally plentiful in the oasis. The young plants are 

 readily eaten by all kinds of stock. 10 



Atriplex hastata L. This is the species that is found in 

 waste grounds throughout the United States but is here a bit 

 thicker and scurfier as befits a desert inhabitant. 63 



Atriplex spatiosa A. Nels. A species with much the ap- 

 pearance of A. hastata common along the roadside at Tuba. 

 It is not included in the Flora of New Mexico and its center of 

 distribution is much farther north. 127 



Atriplex canescens {Vnvsh.) Salt-bush. Plentiful near the 



