110 Trans. Acad. Sci. of St. Louis. 



Leguminosae. 



Cercis canadensis L. Frequent on knolls and ledges. 



Baptisia bracteata (Muhl.) Ell. Frequent on knolls and in dry soil. 



Trifolium carolinianum Michx.* Frequent in dry soil. 



Tephrosia virginiana (L.) Pers. Frequent on knolls and in dry soil. 



Lespedeza virginica (L.) Britton. Occasional on knolls and in dry 

 soil along ledges. 



Stylosanthes biflora (L.) BSP. With the last and about as frequent. 



Lathyrus pusillus Ell.* Locally abundant along banks and in moist 

 situations. 



Linaceae. 



Linum medium (Planch.) Britton. Occasional in dry soil. 



OXAjLIDACEAE. 



Oxalis violacea L. Common in thin dry soil. 



Rut ace ae. 

 Ptelea trifoliata L. Occasional along ledges and near streams. 



POLYGALACEAE. 



Polygala incarnata L. Uncommon in dry soil. 



Polygala sanguinea L. Common on knolls and in dry soil. 



E UPHORBI ACEAE. 



Crotonopsis linearis Michx.* Very common in thin dry soil, some- 

 times almost to the exclusion of other species. 



Acalypha gracilis Gray. Frequent in dry soil. 



Euphorbia maculata L. Common in thin dry soil. Quite villous. 



Euphorbia dentata Michx. Frequent in dry soil. Perhaps intro- 

 duced. 



Anacarihaceae. 



Rhus trilobata Nutt. Frequent along ledges. 



Hypericaceae. 



Hypericum pseudomaculatum Bush. Infrequent in thin dry soil. 

 Hypericum Drummondii (G. & H.) T. & G. Frequent in dry soil. 



ClSTACEAE. 



Lechea tenuifolia Michx. Common in dry soil. 



Cactaceae. 

 Opuntia macrorhiza Engelm.* This or perhaps a new species is 

 common in dry soil and on knolls throughout the barrens. 



