44 University of Texas Bulletin 



Bernardia my ricae folia S. Wats. 



A common shrub on the river bluffs and ravine sides of the Edwards 

 Plateau. It is irregularly branched and has small thick leaves with 

 toothed or crisped edges. 



Texas and New Mexico. 



Chamaesyce Fendleri Small. (Euphorbia Fendleri T. & G.) Spurge. 

 Dry ground. Mt. Barker. 

 Southern plains and prairie states and in Mexico. 



Chamaesyce maculata Small. {Euphorbia maculata L.) Spotted 

 Spurge. 

 Roadsides, etc. 

 Almost throughout North America. 



Chamaesyce nutans Small. 

 Roadsides and waste places. 

 Widespread in eastern and central United States. 



Chamaesyce Nuttallii Small. (Euphorbia petaloidea var. Nuttallii 

 Engelm.) Spurge. 

 Roadsides and waste places. 

 South-central states and Mexico. 



Chamaesyce prostrata Small. (Euphorbia prostrata Ait.) Prostrate 

 Spurge. 



Abundant on roadsides and in waste places. Similar to the follow- 

 ing species, but with leaves slightly larger and toothed at the apex. 

 The plant is a darker green than the carpet weeds and clings less 

 closely to the ground. 



Gulf states and Mexico. 



Chamaesyce serpens Small. Carpet Weed. 



Roadsides and waste ground. A small-leaved prostrate plant, form- 

 ing dense mats over the ground. 



Prairie states and Mexico. 



Chamaesyce villifera Small. (Euphorbia villifera Scheele.) 

 Ravines of Edwards Plateau. 

 Texas. 



Cnidoscolus stimulosus A. Gray. (Jatropha stimulosa Michx.) Bull 

 Nettle. Spurge Nettle. 



Fields and roadsides. Well known for its beautiful white flowers 

 and its stinging hairs. The sting is much worse than that of the 

 true nettle. 



Southeastern states. 



