1898.] 



NATURAL SCIENCES OF PHILADELPHIA. 



25 



1806, in the Rocky Mountains. 

 [Specimen very poor, sterile, not 

 precisely determinable]. 



Potentilla Anserina L. 



The roots are eaten by the na- 

 tives, and taste like sweet pota- 

 toes ; grows in marshy ground. 

 Fort Clatsop, March 13, 1806. 



Potentilla fruticosa L. 



Prairie of the Knobs ; July 5, 



Pursh, Fl. 355. On the banks 

 of rivers in Canada and on the 



1806. [Small but characteristic waters of the Rocky Mountains, 



specimen]. 



Prunus demissa Nutt. 



Prunus, a cherry found near 

 the beaver bents on the Missouri, 

 August 10, 1806. [Specimen 

 poor and sterile]. 



Prunus Virginiana L. 



Prunus, Choak or Pidgeon 

 Cherry. On the waters of the 

 Kooskonskee, 29th May, 1806. 

 [Specimen poor and sterile]. 



Prunus T 



Near the base of the Rocky 

 mounts on the west side near Col- 

 lins's Creek. The shrub about 6 

 or 7 feet high ; June 27, 1806. 

 [Unrecognizable]. 



Prunus ? 



A shrub about 6 feet high from 

 the Kooskooskee, May 7, 1806. 

 [Unrecognizable; dark purple 

 stem, elliptic serrulate leaves]. 



Prunus sp. 



A smaller shrub than the 

 Choak berry, the natives count 

 it a good fruit. On the Koos- 



3 



June, August, Lewis, v. v. in 

 Hortis, v. s. in Herb. Lewis. 



