Heteranthera Pontederiaceae 289 



There is a specimen in the herbarium of DePauw University which was 

 collected by D. T. MacDougal in Putnam County, Sept. 12, 1889. 



Conn., Nebr., southw. to Ga. and Tex. ; also in W. I. and to Cent. Amer. 



2. Heteranthera dubia (Jacq.) MacM. Water Stargrass. Map 598. 

 Rather frequent in the lake area on the shallow borders of lakes, in the 

 Tippecanoe and St. Joseph Rivers, and on sandy bars and mud flats along 

 streams, becoming rare in the southern part of the state. It is so inconspic- 

 uous that it is usually overlooked. Sometimes it grows in great masses with 

 such acquatic plants as Potamogeton and Utricularia. The deepest water 

 from which I have a specimen is 4 feet but I know that it grows in even 

 deeper water. It is most conspicuous on muddy flats in late autumn when 

 the water of its habitat recedes. 



Que. to Oreg., southw. to N. C, Ark. and Ariz. 



