INTRODUCTION 17 



River to the Missouri near the Great Falls and thence down the 

 river. 



Meehan (42), speaking of Lewis collection, says, "From the 

 few (plants) they did collect, Pursh (47) in his 'Flora Americae 

 Septentrionalis,' published in London in 1814, refers to 119, 

 many of which he described as wholly new." He quotes from 

 Pursh as follows: 



"The collection was made during the rapid return from 

 the Pacific. A much more extensive one made on their slow 

 ascent toward the Rocky Mountains and the chains of the north- 

 ern Andes, had unfortunately been lost, by being deposited 

 among other things at the foot of these mountains. The loss of 

 this fine collection is the more to be regretted when I consider 

 Ihat the small collection communicated to me, consisting of about 

 150 specimens, contained about a dozen plants well known to 

 be natives of Northern America." 



The plants were probably taken to England by Pursh and 

 finally deposited in the herbarium of A. B. Lambert. Afterward 

 they found their way into the possession of the Academy of 

 Natural Sciences of Philadelphia and the American Philosophical 

 Society. The plants collected on the outgoing trip between St. 

 Louis and Fort Mandan were sent back and received by the 

 Society November 15, 1905. 



Among the woody plants of the region collected by Lewis 

 are the following: 



Pachystima Myrsiniirs Raf. 



Ceanothus velutinus Dougl. 



Bhamnus Purshiana D. C. 



Amelanchier alnifolia Nutt. 



Crataegus Douglasii Lindl. 



Sorhus samhucifolia (C & N) Roem. 



Prunus demissa Nutt. 



Spiraea discolor Pursh 



Philadelphus Leiuisii Pursh 



Bibes aureuni Pursh 



Bibes viscossisimum Pursh 



Lonicera involucrata Banks 



Artemisia cana Pursh 



Elaeagnus argentea Pursh 



