l6o UNIVERSITY OF MISSOURI STUDIES [308 



64-2. A. nana Nutt. [A. microphylla Pursh]. Small-leaved 



FALSE INDIGO. 



Dry plains between Boulder and Marshall, 5400 ft. (Dan- 

 iels, 521). 



Iowa to Manitoba ; Missouri to Colorado. 



258. PSORALEA L. Indian breadroot. Pom me 

 blanche. 



643. P. tenuiflora Pursh. Few-flowered Indian breadroot. 

 One of the commonest and most characteristic plants of 



the plains and mesas, and in open meadows on the foothills, 

 5100-8000 ft. (Daniels, 297). A white-flowered form is oc- 

 casional (Daniels, 297a). 



Minnesota to Montana; Illinois to Arkansas, Texas 

 and Arizona. 



644. P. argophylla Pursh. Silver-leaf Indian breadroot. 

 Local on the plains and mesas, 5100-6000 ft. (Daniels, 189). 

 Wisconsin to Saskatchewan; Missouri to New Mexico 



and Arizona. 



259. PETALOSTEMON Lam. Prairie clover. 



645. P. oligophyllus (Torr.) Rydb. [P. gracilis oligophyllus 

 Torr. ; Kuhnistera oligophylla (Torr.) Heller]. Slender 

 white prairie clover. 



On the plains and mesas, 5100-6000 ft. (Daniels, 161). 

 Iowa to Assiniboia; Texas to Arizona and Mexico. 



646. P. pnrpureus (Vent.) Rydb. [P. violaceus Michx. ; Kuh- 

 nistera purpurea (Vent.) MacM.]. Violet prairie clo- 

 ver. 



Common on the plains and mesas, 5100-7000 ft. (Daniels). 

 Indiana to Saskatchewan and Alberta ; Missouri to 

 Texas and New Mexico. 



647. P. pubescens A. Nelson. Hairy violet prairie clover. 

 Plains about Boulder, 5600 ft. (Daniels, 349). 

 Colorado. 



