54 University of Texas Bulletin 



Gaura Drummondii T. & G. 



Fields and roadsides, University campus. 

 Texas to Mexico. 



Gaura parviflora Dougl. Wild Honeysuckle. 

 Common in fields and roadsides. 

 Plains and prairie states. 



Gaura sinuata Nutt. ^Wild Honeysuckle. 

 Fields and roadsides. University campus. 

 Southern plains and prairie states and in Mexico. 



Gaura suffulta Engelm. Wild Honeysuckle. Bee Blossom. 



Very common in fields, waste places and roadsides. Abundant on 

 the University campus. 



Oklahoma, Texas and Mexico. 



Hartmannia speciosa Small. Primrose. 



Abundant everywhere in fields, roadsides and waste places. Our 

 most common primrose. Locally called "buttercup" although the 

 flowers are pink. 



Southern plains and prairie states to northern Mexico. 



Isnardia natans Small. (Ludwigia natans Ell.) Marsh Purslane. 

 In muddy ground along Shoal Creek. 

 Southeastern states to Mexico. 



Jussiaea diffusa Forskl. 



In streams and wet ground along streams. Very abundant in 

 Barton Creek. The stems and leaves usually with a reddish tinge. 



Southern states, tropical America and Asia. 



Jussiaea suffruticosa L. 



In wet ground along Barton Creek and Waller Creek. 

 Southeastern states and the tropics. 



Lavauxia triloba Spach. {Oenothera triloba Nutt.) Primrose. But- 

 tercup. 

 Abundant in fields and roadsides. Ours is a yellow-flowered form 

 and probably should be differently named. 



Lavauxia Watsoni Small. (Oenothera triloba var. parviflora S. Wats.) 

 Evening Primrose. 



In rich soil. Similar to the preceding but smaller and opening only 

 in the evening. The petals are yellow, but turn reddish when they 

 wither. 



Kansas and Nebraska, to Oklahoma. 



