60 University of Texas Bulletin 



Cynoctonum Mitreola Britton. (Mitreola petiolata T. & G.) Mitre- 

 wort. 

 Moist soil; creek banks. 

 Southeastern states, West Indies, Mexico. 



Polypremum procumbens L. 

 In the postoak woods. 

 Southeastern states, West Indies, Mexico. 



GENTIANACEAE Gentian Family 



Erythraea Beyrichii T. & G. Mountain Pink. Centaury. 



Dry, rocky hillsides and rock bluffs of the Edwards Plateau. A 

 stiff, much-branched herb with abundant bright pink flowers which 

 will dry without withering. 



Arkansas and Texas. 



Erythraea calycosa Buckl. Centaury. 

 Rare here. 

 Southern central states. 



Eustoma Russellianum Grisib. Blue Gentian. 



Abundant in prairie land and along railroad track, but not com- 

 mon near Austin. The large, rather stiff blue flowers are very 

 showy. 



Southern plains and prairie states. 



Sabbatia campestris Nutt. Texas Star. 



Found occasionally in the postoak woods. The flowers are similar 

 to those of Erythraea Beyrichii, but larger and fewer; and with a 

 conspicuous yellow center. 



Southern prairie states. Very abundant in parts of eastern and 

 southern Texas. 



ASCLEPIADALES 



APOCYNACEAE Dogbane Family 



Amsonia texana Heller. (A. Giliata var. texana.) Texas Star. 

 Hillsides of the Edwards Plateau. 

 Texas. 



ASCLEPIADACEAE Milkweed Family 



Asclepias Lindheimeri Engelm. Milkweed. 

 Dry uplands. 

 Texas, New Mexico and Mexico. 



