1898.] NATURAL SCIENCES OP PHILADELPHIA. 309 



Phacelia menziesi Torr. Hydrophylhim lineare Pursh, Fl. 134. 



April 17, 1806. Rocky— Rock Fort Camp, on the Columbia — 

 not " on the banks of the Missouri," as Pursh has it. 



Plagiobothrys tenellus Gray. 



April 17, 1806. As the last. 

 Krynitskia sp. ? 



April 17, 1806. As the last. 

 Nicotiana quadrivalvis Pursh, Fl. 141. 



October 12, 180 J,.. " The Ricara's town " said was one of the 3 

 Arikara villages which were flourishing in 1804 within 8 miles 

 above the mouth of Wetarhoo River of L. and C, now Grand 

 River, South Dakota — one of them on Ashley Island, the other two a 

 little higher up, on the right bank of the Missouri. Pursh says of 

 N. quadrivalvis, " the tobacco prepared from it is excellent." That 

 makes me believe he never smoked the nasty stuff. 



Mimulus luteus L. Pursh, Fl. 426. 



July 4, 1806. " On the waters of Clark's River " means Hellgate 

 River, close by Missoula, Montana. 



• Orthocarpus tenuifolius Benth. Bartsia tenuifolia Pursh, Fl. 429. 



July 1, 1806. "Valley of Clark's River" means the mouth of 

 Traveller's Rest Creek, the Lou Lou Fork of the Bitter-root River. 



Pedicularis groenlandica Retz. Pursh, Fl. 426. 



July 6, 1806. " On the low plains on the heath of Clark's River " 

 means Prairie of the Knobs on Big Blackfoot River. 



P. scopulorum Gray ? P. elata Pursh, Fl. 425, nee Willd. 



July 6, 1806. As the last. Nothing is simpler than the geogra- 

 phical explanation of the apparent discrepancies in this identifica- 

 tion and the three preceding ones. The Bitter-root, the Hellgate 

 and the Big Blackfoot are three of the sources of Clark's River, 

 coming together in the vicinity of Missoula. July 1st to 6th Lewis 

 went down the Bitter-root to Missoula, up the Hellgate to the Big 

 Blackfoot, and up the latter to within one day's march of Lewis 

 and Clark's Pass of the Continental Divide. As I have said before, 

 neither Lewis nor Clark ever saw Clark's River as understood by 

 modern geographers. 



Pentstemon diffusus Dougl. 



May 20, 1806. Camp Chopunnish. 



