LIST OF THE PLANTS COLLECTED 49 



*225 Potcntilla penns\kauica arachnoidea Lehm. 



Tolerably common on the plains. 

 *226 Potcntilla pennsylvanica strigosa Pursh. 



In grasslands, frequent. 

 [Rosa Arkansana Porter. 



Abundant on the steppe, determination by Fromme.] 

 *227 Rosa Fendleri Crepin. \Yild Rose. 



Common on the steppe. In flower as late as July 23 in 



1910. Abundant in woodlands of buttes. 

 *228 Rosa Sayi Schwein. Longfruited Rose. 



Locally common in woods of Slim Buttes. 



229 Rosa IVoodsii Lindl. 



Plentiful in open woods, and also on the steppe. 



230 Rosa sp. 



Abundant on the plains. Reported by Professor Nelson as 

 propably a new species. Xo. 582. 



231 Rosa sp. 



"These tiny roses I do not know." Professor Nelson. Com- 

 mon in the East Short Pines. 



232 Rubus strigosiis Michx. Red Raspberry. 



In thickets especially in talus at the foot of the escarpments 

 of the buttes. 



233 Sicrersia ciliata G. Don. 

 Abundant on tables and foothills. 



42. POMACEAE (Apple Family) 



234 Auiclanchicr alnifolia Nutt. Juneberry, Service-berry. 

 Scattered specimens wherever copses occur. Very abundant 

 in the buttes. 



235 Cratacgus Shcridana A. Nels. Thorn-apple, Hawthorne. 

 Forming small thickets in coulees, in the gulches in the buttes 

 and occasionally along the valleys in the low-lands. 



43. DRUPACEAE (Plum Family) 



236 Primus americana Marsh. Wild Plum. 



In close thickets in open gulches, at base of cliffs about buttes, 

 and along streams of the plains. 



237 Primus Bcsscxi Bailey. \Yestern Sandcherry. 



Frequent on the dry hillsides especially on the foothills of the 

 buttes. 

 Sig. 4. 



