50 



141. Penstemon eristatus Nutt. Head of Heart River, 

 July 8th. 



142. Castilleja sessiliflora Pursh. Bad Boute Creek, 

 July 28th. 



143. Orthocarpus luteus Nutt. Bad Route Creek, July 28th. 



VERBENACE.E. 



144. Verbena bracteosa Michx. Generally abundant in 

 the prairie dog towns, especially along the Yellowstone. 



LABIATE. 



145. Lycopus sinuatus Linn. Bad Route Creek, July 28th. 



146. Hedeoma Drummondi Benth. Little Missouri, at 

 the mouth of Davis Creek, July 10th. 



147. Hedeoma hispida Pursh. Little Missouri, at the mouth 

 of Davis Creek, July 10th. 



148. Monarda fistulosa Linn. Little Missouri, at the mouth 

 of Davis Creek, July 10th, and the Musselshell Valley, August 21st. 

 This and the above-named species of Hedeoma are common at favor- 

 able localities, from the Missouri to the Musselshell. 



BORAGINACEiE. 



149. Echinospermum Pedowski Lehm. Fort Rice, June 

 loth. 



150. Eritrichium glomeratum D. C Near the Great 

 Bend of Heart River (June 26th), and near the head of Davis Creek 

 (July 9th). 



151. Lithospermum canescens Lehm. Fort Rice, June 

 20th. 



152.. Lithosperrnum longiflorum Spreng. Fort Rice, 

 June 13th. 



POLEMONIACE^E. 



153. Phlox Douglassi Hooker. Prairies west of Fort Rice, 

 June 22d. Very abundant, in places nearly covering the ground. 



154. Collomia linearis Nutt. Crossing of the Big Muddy, 

 June 30th. Common. 



