56 THE BIOLOGY OF HARDING COUNTY 



65. PRIMULACEAE (Primrose Family) 



318 Androsace occidentals Greene. 



Common on Rabbit Butte, etc. (Perkins Co.) 



319 Steironema ciliatinn (L.) Raf. Fringed Loosestrife. 

 Fairly abundant in shady valleys well np in the buttes. 



66. OLE ACE AE (Olive Family) 



320 Fra.rinus lanceolata Borck. Green Ash. 



Abundant in small groves along all streams except in the 

 drier parts of the steppe. Predominant in coulees. 



67. GENTIAXACEAE (Gentian Family) 

 *32i Gentiana af finis Griseb. 



Abundant along brooks. 



*322 Gentiana plebeja Cham. 



Uncommon in the Little Missouri floodplain and on the foot 

 hills of the buttes. 



323 Gentiana pubenila Michx? Blue Prairie Gentian. 



Locally abundant with blue stem grass in mesophytic north- 

 eastern draws near Lodge Pole Butte. In full bloom Aug- 

 ust 10. 



*324 Gentiana strictiflora (Rydb.) A. Nels. Yellow Gentian. 

 Fairly abundant on wooded hill sides in Cave Hills. 



68. APOCYXACEAE (Dogbane Family) 



325 Apocyniun androsacmifolium L- Indian Hemp. 

 Pretty general on the foothills of the buttes. 



69. ASCLEPIADACEAE (Milkweed Family) 



326 Accraies liridflora Ivesia. Brit. Green Milkweed. 

 Locally abundant along the creeks and rivers. 



327 Asclepias pumila (Gray) Vail. Small Milkweed. 

 Frequent on plains, especially their rougher portions. 



328 Asclepias spcciosa Torr. 

 Frequent along the larger valleys. 



329 Ascelpias lerticillata L. 



Rare in the valleys on the steppe. 

 70. COXYOLYULACFYE (Morning-glory Family) 



330 Coni'okntlus sepimn L. Hedge Binchvecd, \Yild Morning- 



glory. 

 Occasional in thickets and about dwellings. 



