No. 2. 



CATALOGUE OF PLANTS COLLECTED EAST OF THE ROCKY MOUNTAINS. 



BY PROFESSOR ASA GRAY. 



PLANTS COLLECTED EAST OP THE ROCKY MOUNTAINS. 



This collection was made by Dr. Suckley from the Mississippi river westward to Fort Benton, 

 and Lieutenants Donelson and Mullan along the Missouri river from near St. Louis to Fort 

 Union. All the plants were collected between May 10 and the end of August. This collection 

 all belongs to one and the same region, physically and botanically- — that of the plains of the 

 northwestei-n portion^of the great Mississippi basin. The species may, therefore, be enume- 

 rated without regard to their particular localities, which, moreover, are not always recorded in 

 the collection. Little novelty was to be expected in a collection made in rapidly traversing a 

 district already so repeatedly and thoroughly investigated. The species are, therefore, 

 enumerated in the form of a classified list, such remarks or descriptive observations as are 

 requisite being appended, as are the characters of some now plants ; for this collection is 

 found to contain three undescribed species and one new genus. 



Clematis Virginiana, Linn. Yermilion river. Mo. 



Pulsatilla patens, DC. 



Anemone Pennstlvanica, Linn. 



Anemone cylindrica. Gray. 



Thalictrum C0RNUTi,Linn. 



Ranunculus divaricatus, Schrank. This is the Ranunculus aquatilis in part of Linnajus 

 and of American authors, and R. circinatus. Sixth. It is the only species of the section 

 Batrachium which I have seen in this country. 



Ranunculus abortivus, Linn. 



Ranunculus recurvatus, Poir. 



Ranunculus repens, Linn. 



Aquilegia Canadensis, Linn. ' 



Delphinium tricorne, Michx. 



Delphinium azureum, Michx. 



Act^a rubra, Bigelow. 



Menispermum Canadense, Linn. 



Podophyllum peltatum, Linn. 



Argemone Mexicana, Linn. var. albiflora. 



CORYDALIS AUREA, Willd. 



Nasturtium sessiliflorum, Nutt. 



