44 . THE BIOLOGY OF HARDING COUNTY 



155 Monolepis Nuttalliana (R. & $.) Engelm. 

 Occasional in blowouts, on ''hard pan." 



156 Solsola pestifer A. Nels. Russian Thistle. 



A very serious weed in small grain and flax fields. Occasion 



on the sod. 

 *I57 Suaeda erecta (Wats.) A. Nels. 



Abundant on bare clay of blowouts on flats along streams. 



Also in fields. (Perkins Co.) 



[Suaeda depressa (Pursh) Wats. 



Reported by Fromme.] 

 *I58 Suaeda Moquinii (Torr.) A. Nels. 



Locally common on foothills and tables. 



30. AMARANTHACEAE (Amaranth Family) 



159 Amaranthus retrople.vus L. Redroot. 

 Rarely introduced, near Buffalo. 



160 Amaranthus graecizans L. Tumble weed. 

 More commonly introduced. 



31. NYCT AGIN ACE AE (Four-o'clock Family) 



*i6i Abronia micrantha (Torr.) Chois. 



Infrequent in sandy areas of floodplains. 



162 Allionia linearis Pursh. 



Abundant in fields, frequent along roads and occasionally 

 on the steppe. 



163 Allionia hyctaginea Michx. 



Rare on the floodplain of the Little Missouri near Ashcroft. 



*i64 Allionia pilosa (Nutt.) Rydb. 

 Occasional on sand. 



32. PORTULACACEAE (Purslane Family) 



165 Talinnm peniflonim Nutt. 

 Locally abundant on gumbo spots. 



33. CAROPHYLLACEAE (Pink Family) 



166 Agrostemina gigatho L. Corn Cockle. 

 Rare, in fields, Perkins Co. 



167 Cerastiiiui arrcnsc L. Chickweed. 



Abundant in the thin soil of the edge of the tables arc! in 

 cracks in the cap rock of the 



