298 PROCEEDINGS OF THE ACADEMY OF [1898. 



Lupinus argenteus Pursh, Fl. 468. 



July 7, 1806. " On the Cokahlaishkit " — an interesting locality. 

 This is the River of the Road to Buffalo of L. & C, now the Big 

 Blackfoot River, a branch of Hellgate River. On the 7th Lewis 

 was on its headwaters, as this is the day he went over Lewis and 

 Clark's Pass of the Continental Divide to the Middle Fork of 

 Dearborn's River, thus passing from Deer Lodge County to Lewis 

 and Clark County, Montana. 



Lupinus serioeus Pursh, Fl. 468. 



June 5, 1806. Camp Chopunnish on the Kooskooskee. 



Oxytropis nana Nutt. var. 0. argentata Pursh, Fl. 473. 



July — , 1806. " Near the head of Clark's River " means the Bit- 

 ter-root River at the mouth of its Lou Lou branch, the Traveller's 

 Rest Creek of L. & C, and the date is July 1st or 2d, when Lewis 

 was botanizing as the Journal shows, p. 1065 of my edition. See 

 Trifollum microcephalum, below. 



Petalostemon violaceus Mchx. Pursh, Fl. 461. 



July 22, 1806. " On the Missouri ; " impossible. At this date 

 Lewis was on Cut-bank Creek, one of the main headwaters of 

 Maria's River, in N. W. Montana near the foot of the Rocky 

 Mountains, and Clark was on the Yellowstone. No doubt Lewis 

 collected the specimen. 



September 2d, year not given ; no locality indicated. If 1804, at 

 Bonhomme, South Dakota ; if 1805, on Fish Creek, a tributary of 

 Salmon River, Idaho ; if 1806, at or near James' River, South 

 Dakota. The first and third of these are practically the same 

 locality, as the expedition crossed the years 1804 and 1806 in pass- 

 ing Bonhomme Island on September 1st. I presume the year is 

 1804, for, in the case of the related Psoralea argophylla, collected 

 October 17, 1804, and in the present case of Petalostemon violaceus, 

 Lewis makes similar remarks on the use of these plants by the 

 Indians in decoctions for wounds. 



Psoralea argophylla Pursh, Fl. 475. 



October 17, 1801,.. On the Missouri, very near the mouth of 

 Cannonball River, North Dakota. 



Psoralea tenuiflora Pursh, Fl. 475. 



September 21, 1801,. Great Bend of the Missouri, as stated. 



