36 University of Texas Bulletin 



Prosopis glandulosa Torr. (P. juliflora var. glandulosa Sarg.) 

 Mesquite. 

 Abundant almost everywhere. Our most common tree. 

 Spreading from the southwest over the prairies of Texas. 



CASSIACEAE Senna Family (Under Leguminosae) 



Cassia Lindheimeriana Scheele. Senna. 



Abundant on the dry hills of the Edwards Plateau. 

 Texas to Arizona and in Mexico. 



Cassia occidentalis L. Senna. 

 Occasional here. 

 Southern states and in Mexico. 



Cassia Roemeriana Scheele. Senna. 



Abundant on the dry hills of the Edwards Plateau. 

 Texas, New Mexico, and Mexico. 



Cercis occidentalis Torr. Red-bud. Judas-tree. 



Abundant in ravines and on hillsides of the Edwards Plateau. 

 A small tree, conspicuous in the spring with its abundant pink 

 blossoms. Peculiar in the production of flower clusters from buds 

 on old branches. 



Texas and Northern Mexico. Closely related to C. canadensis of 

 the eastern states. 



Gleditsia triacanthos L. Honey Locust. 



A common shade tree in Austin. Growing wild on the river flood 

 plains. A tree easily recognized by its branching thorns. 



Eastern North America. 



Parkinsonia aculeata L. Retama. Horsebean. 



Abundant locally, on the river flood plain and in waste places, 

 roadsides, etc. 



Tropical America, Mexico, and from the Gulf States to California. 



KRAMERIACEAE Krameria Family (Under Leguminosae) 



Krameria secundiflora DC. 



Common in dry ground along railroad tracks, etc. A nearly pros- 

 trate plant with irregular reddish purple blossoms. 



Southeastern states and Mexico. 



