46 THE BIOLOGY OF HARDING COUNTY 



181 Thalictrum dasycarpnm F. & L. Meadow Rue. 

 Occasional in the small openings along streams at high alti- 

 tudes in the buttes, sometimes abundant. 



35. BERBERIDACEAE (Barberry Family) 



182 Berberis aquifolium Pursh. 



Common in the forest reserves. Surprising abundant on the 

 eastern foothills of Slim Buttes in Reva Gap. 



36. PAPAVERACEAE (Poppy Family) 



183 Argemone intermedia Sweet? Prickly Poppy. 

 Occasional on the steppe. 



184 Corydalis aurea Willd. False Dutchman's-breeches. 

 Several clumps were found in the higher ravines of the 

 Short Pines. 



37 CRUCIFERAE (Mustard Family) 



*i85 Arabis caduca A. Nels. 

 Rare, Short Pine Hills. 



1 86 Arabis hirsuta Scop. 



Wide spread and fairly plentiful. 



187 Brassica arvensis (L.) B. S. P. Yellow Mustard. 

 Sparingly introduced into fields. 



188 Camelina sativa Crantz. False Flax. 

 Local in badlands near East Short Pines. 



189 Capsella bursa-pastoris Medik. Shepherd's Purse. 

 Naturalized from Europe but now very abundant everywhere. 



190 Draba nemorosa L. 



In fields and on plains. 



191 Hrysimum asperum DC. 



Tolerably common on the steppe throughout but especially on 

 the foothills. 



192 Hrysimum asperrimum (Greene) Rydb. 



On bare clay in the steppe, not at all common. 



193 Hrysimum cheiranthoides L. Western Wallflower. 



Wide spread but not abundant, open woods, brooks and steppe. 



194 Hrysimum inconspicuum (Wats.) Mac M. 

 Rare on the steppe, Rabbit Butte, Perkins Co. 



195 Lepidum apetalum Willd. Pepper grass. 

 Sparingly introduced on the steppe. 



