A GUIDE AND KEY TO AQUATIC PLANTS 125 



5. Sepals shorter than neck of calyx tube or about as long; 6. 

 leaves toothed. 



6. Plant tuberous rooted 6. R. virginicat 



6. Plant not tuberous rooted 7. R. stricta. 



1. R. cubensis Griseb.— Swamps, Coastal Plain, Florida to Georgia 

 and Mississippi. 



2. R. mariana L. Aleadow Beauty — Various situations over all of 

 our range. As treated here it includes R. nashii Small. 



3. R. lanceolata Walt. — Small species occurring in the Coastal Plain, 

 Florida north and west to the limits of om- territory. 



4. R. parviflora Chapm. — Known to occur only in shallow ponds 

 near Apalachicola, Florida, although the senior writer collected speci- 

 mens which might be referred to this species from a limesink in South- 

 west Georgia. 



5. R. aristosa Britton— Phieland swamps. Coastal Plain, Georgia 

 north to beyond the limit of our range. 



6. R. virginica L. — Wet situations over all of our range. 



7. R. stricta Pursh — Coastal Plain species, supposed to range from 

 Georgia to North Carolina and Mississippi. 



LYTHRACEAE Loosestrife family 



1. Didiplis Raf. 



D. diandra (Nutt.) Wood. Water Purslane — Infrequent but range 

 includes all of our area. 



2. Ammannia L. 



1. Petals present 2. 



1. Petals wanting 1. A. latijolia. 



2. Style long and slender 2. A. coccinea. 



2. Style verj' short and stout 3. A. teres. 



1. A. latijolia L. — Limesinks and swamps. South Florida and the 

 Florida Keys. 



2. A. coccinea Rottb. — Range includes all of our territory, but most 

 frequent iji non-acid regions. 



3. A. teres Raf. — Florida north to beyond the limit of our region. 

 Supposed to differ from A. latijolia only in having a corolla. The 

 senior writer has seen it onh' near the coast. 



3. Rotala L. 



R. ramosior (L.) Koehnt — Ranges over all our territorj^, seeming 

 to prefer non-acid situations. 



4. Decodon J. F. Gmel. 



D. verticillatus (L.) Ell. Water Willow — Fairly frequent over all 

 of our territory. wShows an extremely wide range of acidity tolerance 

 as it is found in the very acid Okefinokee Swamp and the neutral 

 Reelfoot Lake alike. 



