1898.] NATURAL SCIENCES OF PHILADELPHIA. 305 



Artemisia longifolia Nutt. A. integrifolia Pursh, Fl. 520. 



October 1 and 3, 1804-. See preceding species of this genus. L. 

 and C. do not speak of sage brush in their Journal at any of the 

 above dates. On April 14, 1805, when they were on the Missouri 

 between the Little Missouri and present White Earth Rivers, they 

 speak of aromatic plants "resembling the sage, hyssop, wormwood," 

 etc., p. 273 of my edition. 



Artemisia ludoviciana Nutt. ? 



April 10, 1806. " Rockford Camp" as given is impossible, as 

 L. & C. were not at Rock Fort Camp till April 15th that year. 

 On the 10th they had reached the head of tide-water of the Colum- 

 bia, vicinity of Beacon Rock, and were drawing their boats up the 

 Cascades from Brant Island. 



Aster oblongifolius Nutt. 



September 21, 1804- Big Bend of the Missouri, as correctly 

 stated. 



Aster oreganus Nutt. 



October — ,1805. " Lewis River." If on Lewis' River itself the 

 date was October 10— 16th, while L. & C. were descending Snake or 

 Lewis' River from the mouth of the Kooskooskee to the Columbia 

 itself. 



" Bidens-like." 



October — , 1805. " Lewis River," as last said. 



Balsamorrhiza sagittata Nutt. Buphthalmum sagittatum Pursh, Fl. 564. 



April llf, 1S06. On the Columbia, one day below Rock Fort 

 Camp. 



July 7, 1806. Lewis and Clark's Pass of the Continental Divide, 

 near head of Big Blackfoot River, in Dear Lodge Co., Montana. 



Bigelowia graveolens Gray. Chryeocoma dracwncnloid.es Pursh, Fl. 517. 



May 6, 1806. Main Kooskooskee River, below Camp Chopun- 

 nisb. 



October 2, 180 4. Just above Little or Lookout Bend of the Mis- 

 souri ; see Artemisia cana above. 



Bigelowia graveolens albicaulis Gray. Chrysoconia nauseosa Pall, in herb. Pursh, 

 Fl. 517. 



October 15,1805. "On the Columbia River" as given is not 

 quite right, as that day L. & C. were descending Snake River, and 

 did not reach its confluence with the Columbia till the 16th. 



