Seed Plants, Ferns, Fern Allies of the Austin Region 45 



Croton fruticulosus Engelm. 

 Edwards Plateau. 

 Texas, New Mexico and Mexico. 



Croton monanthogynus Michx. 

 Abundant in waste places. 

 Prairie and Gulf states to Mexico. 



Croton texensis (Muell.) Arg. 



Abundant in waste places, roadsides, etc. The Crotons can be 

 easily recognized by the peculiar odor of their leaves when crushed. 



Plains and prairie states. 



Dichrophyllum bicolor Kl. & Garcke. (Euphorbia bicolor Engelm.) 

 Snow-on-the-mountain. 



Low ground, pastures and roadsides. A tall herb with the leaf- 

 like bracts of its flower clusters white-margined. 



Southern-central states. 



Dichrophyllum marginatum Kl. & Garcke. (Euphorbia marginata 

 Pursh.) Snow-on-the-mountain. 

 Roadsides, etc. Similar to the preceding, but smaller. 

 Central states. 



Ditaxis humilis Pax. (Argythaminia humilis Muell.) 

 Dry ground and waste places. 

 South-central states. 



Ditaxis mercurialina Coulter. (Argythamnia mercwrialina Nutt.) 

 Dry ravines. Abundant in the Edwards Plateau region. 

 South-central states. 



Phyllanthus polygonoides Nutt. 

 Abundant on the campus. 



Dry hillsides, particularly of the Edwards Plateau. 

 Texas. 



Poinsettia dentota Small. (Euphorbia dentata Michx.) Toothed 

 Spurge. 



Poinsettia havanensis Small. (Euphorbia heterophylla var. grami- 

 ni folia Engl em.) 

 Found along Shoal Creek and Barton Creek. Not common. 

 From Florida to Texas, and in tropical America. 



