MUENSCHER: AQUATIC PLANTS 63 



HYDROCHARITACEAE 



Thalassia testudinum Koenig and Sims. 



Common in salt water along the coast between Puerto Barrios and Living- 

 ' ston. Puerto Barrios, 12063. 

 Vallisneria americana Michx. 



In shallow bays of Lake Izabal, Golfete and Rio Dulce. Estor, Lake Izabal, 



12621; Rio Dulce, 12620. 



GRAMINEAE 



Panicum paludivagum Hitchc. and Chase. 



In shallow water ; the spreading rhizomes sometimes form dense mats in 



stagnant bays and sluggish streams. Lake Amatitlan, 12214 ; Panzos, Rio 



Polochic ; Rio Dulce. 

 Paspalum virgatum L. 



In brackish marshes, Puerto Barrios, 12232. 

 Phragmites communis L. 



In shallow water and marshes along the shore of Lake Amatitlan and 



Golfete. 



CYPERACEAE 



Cyperus canns Presl. 



In swamps along shore of Lake Amatitlan, 12052. 

 Cyperus gigantcus Vahl. 



In sloughs and swamps between Puerto Barrios and Bananero. 

 Cyperus Humboldtianus Steud. 



Wet shores of streams and ponds. Finca Moca, 12039;- Rio Lima, 12032a. 

 Cyperus Luzulae (L.) Retz. 



In swamps and borders of streams. Panzos, 12570. 

 Eleocharis retro flexa (Poir.) Urban. 



In shallow water and wet borders of streams and lakes. Lake Atitlan, 12028 ; 



springy bank by waterfall, 7000 ft. elevation, Vulcan Santa Maria, 12044. 

 Eleocharis caribaea (Rottb.) Blake. 



In warm water by edge of hot spring on shore of Lake Amatitlan, 12050. 

 Eleocharis filiculmis Kunth. 



In shallow water and marshes bordering streams and lakes. Rio Coban, 



Tactic, 12025; Finca Moca, 12037. 

 Eleocharis geniculata (L.) R. & S. 



Along borders of lakes, ponds and streams. Lake Atitlan, 12056; Finca 



Moca, 12036; Rio Coban, Tactic, 12026. 

 Eleocharis interstincta (Vahl.) R. & S. 



In shallow water, Lake Amatitlan, 12055. 

 Fimbristylis miliacea (L.) Vahl. 



In lowland marshes and on wet shores. Rio Lima, 12032; Puerto Barrios, 



12015. 



