i\o. 2. 



CATALOGUE OF PLANTS COLLECTED EAST OF THE ROCKY MOUNTAINS. 



BY PROFESSOR ASA GRAY. 



PLANTS COLLECTED BAST OF THE ROCKY MOUNTAINS. 



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

 and Lieutenants Donelson and MuUan along the Missouri i-iver 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 

 northwestern 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 new plants; for this collection is found 

 to contain three undescribed species and one new genus. 



Clematis Yirgikiana, Linn. Vermilion river, Mo. 



Pulsatilla patens, DC 



Anemone Pennsylvanica, Linn. 



Anemone cylindrica. Gray. 



Thalictrum cornuti, Linn. 



Ranunculus diyaricatus, Schrank. This is the Ranunculus aquatilis in part of Liunajus 

 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 eepens, Linn. 



Aquilegia Canadensis, Linn. 



Delphinium tricorne, Michx. 



Delphinium azureum, Michx. 



AcTiEA RUBRA, Bigelow. 



Menispermum Canadense, Linn. 



Podophyllum pelt^tum, Linn. 



Argemone Mexicana, Linn. var. albiflora. 



CORYDALIS AUREA, Willd. 



Nasturtium sessiliflorum, Nutt. 



