78 EXPLORATION OF THE COUNTRY BETWEEN 
Fort Union, near the Muscle-shell, it covers the bottoms, to the exclu- 
sometimes two or three inches in diameter. I observed the Lleagnus 
Argentea in but one locality, on the high hills above Fort Clark. 
the edible roots we find the most important one to be Psoralea esculenta, — 
Lana) 
The lower tribes of the Sioux, who have but little game, subsist 
almost entirely on it for several months of the year. It is eaten raw 
i 5 
sandy borders of streams, and is procured during February and March. 
any of the others before mentioned, but one which is oftentimes o: 
much importance to the hungry voyageur or Indian is the rosebud, as. 
it is called, that is the fruit of a species of Rosa that remains on the 
