51 



CONVOLVULACEJE. 



155. Calystegia sepium R.Br. Valley of the Yellowstone, 

 near the mouth of the Bio- Horn, August 12th. 



SOLANACE^. 



156. Physalis pubescens Linn. Heart River Crossing 

 (June 26th) and the Yellowstone, opposite Shell Point (July 25th). 

 Seen at only two or three localities, in sandy places, near streams. 



157. Solanum triflorum Nutt. Valley of the Yellowstone, 

 at numerous localities. Very much eaten by the Doryphora 10- 

 lineata Say, with which it was almost always infested. 



158. Solanum rostratum Dunal. Crossing of the Big 

 Muddy, June 30th. 



APOCYNACEJE. 



159. Apocynum androssemifolium Linn. Fort Rice, 

 June loth. 



160. Apocynum cannatainum Linn. Crossing of the Big 

 Muddy, July 1st. 



ASCLEPIADACE^. 



161. Acerates viridiflora Ell. Near the Great Bend of 

 Heart River, June 23d. Common on the prairies. 



162. Acerates lanuginosa Descainse. Near the Great 

 Bend of Heart River, June 23d. 



NYCTAGINACEiE. 



163. Oxybaphus angustifolius Torr. Heart River, June 

 26th. 



164. Oxybaphus nyctagineus Sweet. Heart River, June 

 26th. 



165. Abronia cycloptera Gray. Near Shell Point, Yellow- 

 stone River, July 19th. 



166. Abronia fragrans Nutt. Near Shell Point, Yellow- 

 stone River, July 1 9th. 



