i6o 



Trifolhiin prateiise, L. Red Clover. 



Sparingly naturalized in the INIinnesota and Sioux 

 valleys. 



Lotus Ainericanus, (Nutt.) Bisch. Prairie Bird's-foot 

 Trefoil. 

 Hosackia ptirshiana^ Benth. 



On low, sandy land, mostly in the vicinity of streams, 

 locally very abundant; it is the most nutritious of all our 

 native forage crops. In cultivation, however, its growth 

 is uncertain. The name of " Dakota Vetch " has been 

 applied to it by J. G. Smith. 



Psoralea tenuiflora, Pursh. Few-flowered Psoralea. 



Common in dry soils from the Missouri river valley 

 westward. 



Psoralea dig-itata, Nutt. Digitate Psoralea. 



Occasional in dry soils from the Missouri river west- 

 ward. 



Psoralea argophylla, Pursh. Silver-leaf Psoralea. 

 Very abundant throughout the state. 



Psoralea cuspidata, Pursh. Large-bracted Psoralea. 



Common on dry hills and banks from the Missouri 

 valley westward. 



Psoralea esculenta, Pursh. Prairie Turnip, " Indian 

 Turnip." 



On sandy knolls throughout the state; common. 



Psoralea lanceolata, Pursh. Lance-leaved Psoralea. 



In the southern part of the Sioux valley; uncommon. 



Amorplia fruticosa, L. False Indigo. Lead Plant. 

 Bordering streams and lakes throughout the state. 

 Amorpha nana, Nutt. Fragrant False Indigo. 

 Amorpha microphylla^ Pursh. 



On banks and prairies from the James valley west- 

 ward to the Black Hills; also reported from Sioux Falls 

 in the Sioux valley; more abundant from the Missouri 

 river westward. 



