88 ftTBLIC HEALTH BULLETIN NO. 286 



3. Whole spikelet falling away from the main rachis 3. C. strigosus. 



4. Stems naked below; rachilla of spikelet winged_ 4. C. haapan. 



4. Stems leafy below , 5. 



5. Achenes narrowly ellipsoid; scales of spikelet about 2.5 5. C. virens. 



mm. long. 



5. Achenes linear; scales of spikelet about 2 mm. long 6. C. pseudovegetus. 



1 . C. flavescens L. — Shallow water and muddy places over most 

 of the Southeast, frequent. 



2. C. erythrorhizos Muhl. — Also distributed over most of our 

 territory. 



3. C. strigosus L. — Common over all of the Southeast, sometunes 

 in deeper water than the preceding. 



4. C. haspan L. — Often truly aquatic, seems to prefer acid situations. 

 Coastal Plain, Florida north and west to beyond the limits of our 

 territory. 



5. C. virens Michx. — Collected from aquatic areas near the coast in 

 Georgia, range includes all of our Coastal Plain. 



6. C. pseudovegetus Steud. — Fairly common in shallow waters, 

 mostly in Coastal Plain, Florida north and west to beyond the limits 

 of om- area. In addition to the six species of Cyperus here enumerated, 

 there are several others which may occasionally be found in aquatic 

 habitats. 



3. Fimbristylis Vahl 



1. Achene lenticular __^ 1. F. annua. 



1. Achene 3-angled 2. 



2. Spikelets subglobose 2. F. miliacea. 



2. Spikelets narrowly linear 3. F. autumnalis. 



1. F. annua (All.) R. & S. — Noted in shallow water along the 

 coast, introduced Coastal Plain species, Florida to Georgia and west- 

 ward to beyond the limits of our territory. 



2. F. miliacea Vahl — Introduced species, collected by the senior 

 writer from several stations near the coast in Georgia, also known to 

 occur in North Florida. 



3. F. autumnalis (L.) R. & S. — Common over all of our territoiy. 

 Variety mucronulata (Michx.) Fernald is the only form which the 

 writers have encountered. There are in addition perhaps one or two 

 unlisted species of this genus which may occasionally be found in 

 fresh water. 



4. Eleocharis R. Brown 



1. Spikelets little or no thicker than the stem; scales 2, 



mostly leathery. 

 1. Spikelets much thicker than the stem; scales mostly 7. 

 membraneous. 



2. Stem with definite septa making it appear 3. 



nodose. 

 2. Stem not nodose-septate 4. 



