300 PROCEEDINGS OF THE ACADEMY OF [1898 



Potentilla anserina L. 



March 13, 1806. Fort Clatsop, L. & C. winter quarters of 1805- 

 06, a short distance up their Netul, now commonly called Lewis and 

 Clark's River, a small stream which falls into the Columbia near 

 its mouth on the Oregon side. 



Potentilla fruticosa L. Pursh, Fl. 355. 



July 5, 1806. " Prairie of the Knobs," as given, is a remakable 

 place on the Cokahlaishkit or Big Blackfoot River, one day west of 

 Lewis and Clark's Pass, in Deer Lodge County, Montana. It is 

 also called Blackfoot Prairie and Stevens' Prairie, but Lewis did 

 not reach it till July 6th. 



Primus demissa Nutt. 



August 10, 1806. " A cherry found near the beaver bents on the 

 Missouri." I do not know what these are, but the place meant is 

 present Beaver Creek, in Flaunery Co., North Dakota, almost on 

 the border of Mountraille Co., about where present White Earth 

 River (not the one so named by L. & C.) falls into the left bank of 

 the Missouri. The Journal of this date, p. 1173 of my edition, 

 has this note : " In the low grounds of the river Captain Clark 

 found today a species of cherry which he had never seen before, 

 and which seems peculiar to this small district of country, though 

 even here it is not very abundant." No identification was offered 

 in my work, as I had no hint of what the species was, and I am 

 particularly j)leased now to find it out. 



Prunus virginiana L. 



May 29, 1806. Camp Chopunnish. 

 Prunus 1 



June 27, 1806. On the Lo Lo Trail, east of Lo Lo Fork (Col- 

 lins' Creek), and west of the main range of the Bitter-root Mount- 

 ains, Shoshone Co., Idaho. 



Prunus ? 



May 7, 1806. Main Kooskooskee River above Colter's or Pot- 

 latch Creek, and below the mouth of the Chopunnish or North Fork. 



Prunus sp. (P. pumila of Mr. Meehan's footnote.) 



May 29, 1806. Camp Chopunnish. 



Purshia tridentata DC. Tigarea tridentata Pursh, Fl. 333, t. 15. 



July 6, 1806. Prairie of the Knobs, as above described for 

 Potentilla fruticosa. 



