16 

 SALICACEAE. 



Salix Longifolia L. 



(S. Fluvial ilis Xutt.) 



Two or three stunted trees near the station. This is 

 the common willow along the banks of the .Mississippi. 



ULMACEAE. 



Celtis Mississipiensis Bose. 



A few stunted trees on the ridges. 

 Celtis pumila Pursh. 



Occurring occasionally in ground that has been cul- 

 tivated. 



URTICACEAE. 



Urtica dioica L. 



( chamaedryoides Pursh . ) 

 Parietaria Floridana Xutt, 



POLYGONACEAE. 



Polygonum opelousanum Ridd. 



Collected by Prof. S. M. Tracy at Cameron. Collected by 

 the writer in St. Tammany parish. 

 Polygonum punetatum Ell. 



(P. acre H. B. K.) Over the whole State. 

 Polygonum hydropiperoides Michx. 



(P. mite Pers.) All over the State. 

 Polygonum aviculare L. 



Rare in Cameron parish. Common almost everywhere. 

 Polygonum convolvulus L. 



Common over the State. 

 Piumex verticillatus L. 



Growing in ditches. 



