54 



shell, it forms quite thick forests, occupying a considerable portion of 

 the bottom-lands of these streams. 



CONIFERJE. 



196. [? Pinus Engelmanni Torr.] Occurs abundantly along 

 the Yellowstone bluffs, above the Great Porcupine Creek, and along 

 the bluffs of the Musselshell. It also occupies much of the broken 

 country between the Yellowstone and Musselshell, above the Porcu- 

 pine Creeks, the country as far as the eye can see seeming quite 

 well-wooded; generally of small size and quite thinly scattered. 



197. Juniperus Sabina var. procumbens Pursh. Great 

 Bend of Heart River, June 24th. Common on the tops of the buttes 

 east of the Yellowstone. 



LILIACE^E. 



198. Lilium Philadelphicum Linn. Great Bend of Heart 

 River, June 24th. 



199. Smilacina stellata Desf. Fort Rice, June 15th. 



200. Polygonatum giganteum Dietrich. Fort Rice, June 

 15th. 



201. CalochortUS INuttalli T. & G. Grassy hillsides, near 

 the Crossing of the Little Missouri, July 11th. Not common, and 

 seen at only a few localities. 



202. Allium reticulatum Nutt. Fort Rice, June 13th. 

 Very abundant throughout the prairies east of the Little Missouri; 

 perhaps with other species. 



203. Zygadenus glaueus Nutt. Near Fort Rice, June 20th. 



204. Yucca angustifolia Nutt. Common, especially between 

 the Missouri and Little Missouri Rivers. 



IRIDACE.E. 



205. Sisyrinchium Burinudiana Linn. Common in the 

 moist prairies east of the Yellowstone. 



COMMELYNACE.E. 



206. Tradescantia Virginica L. Common in the moist 

 prairies east of the Little Missouri. 



