40 University of Texas Bulletin 



Petalostemon pubescens Heller. (P. violacens var. pubescens Gray.) 

 Prairie Clover. 

 Common on the dry hillsides of the Edwards Plateau. 

 Texas. 



Petalostemon purpureus Rydb. (P. violaceus Michx.) Prairie Clover. 

 On the flood plain. 

 Northern prairies to Texas. 



Psoralea cuspidata Pursh. 



Dry hills of the Edwards Plateau. 

 Plains and prairie states. 



Psoralea hypogaea Nutt. 



Common on the dry hillsides of the Edwards Plateau. 

 Southern plains states. 



Psoralea rhombifolia T. & G. 

 Flood plains. Barton Creek. 



Sesban macrocarpa Muhl. (Sesbania.) 



Flood plains. Barton Creek, near the stream. A tall annual plant 

 with large yellow flowers, and slender pods about a foot long. 



Southeastern states to Central America. 



Sophora affinis T. & G. 



In the hills of the Edwards Plateau and in roadside thickets in 

 lower ground. Less common than the following. It can easily be dis- 

 tinguished from the mountain laurel by its lavender flowers, thinner 

 leaves and smaller pods. The pods, constricted between their sperical 

 seeds suggest a string of black beads. 



Texas to Arkansas. 



Sophora secunidflora DC. Mountain Laural. Coxal Bean. 



Very abundant on the hillsides of the Edwards Plateau. An ever- 

 green shrub well known by its large clusters of purple heavy-scented 

 flowers. Its large red seeds are said to be poisonous. 



Arkansas to Texas. 



Trifolium carolinianum Michx. Clover. 



Abundant in waste places and roadsides and open woods. 

 Southeastern states. 



Vicia Leavenworthii T. & G. Vetch. 



Dry ground, meadows and roadsides. Abundant on the campus. 

 Arkansas to Texas. 



