62 TORREYA 



EQUISETACEAE 



Eqnisetum giganteum L. 



In shallow water and marshes along streams, at 7000 ft. elevation on Vulcan 

 Santa Maria, 12183; Rio Coban, Tactic., 12182. 



TYPHACEAE 



Typlia truxillensis HBK. 



Locally abundant in shallow water and marshes bordering lakes and 

 streams. Lake Amatitlan, 12617 ; Lake Izabal ; Puerto Barrios ; Rio Polo- 

 chic, near Pancajche. 



NAJADACEAE 



Najas guadalupensis (Spreng.) Magnus. 



In the larger lakes, in water to a depth of ten feet. Lake Amatitlan, 12001, 



12002, 12003; Lake Atitlan, 12004. 

 Najas guadalupensis Morong. var. curassavica (A. Br.) Magnus and Rendle. 



In a spring-fed pond at 8000 ft. elevation. Quiche. 12006. 



POTAMOGETONACEAE 



Potamogeton fragillimus Hagstr. 



In shallow bays of Lake Atitlan, 12066, 12068, 12069, 12070, 12077. 



Potamogeton joliosus Raf. var. genuinus Fernald. 



In shallow ponds and lakes. San Felipe, Lake Izabal, 12074; Finca Moca, 

 12075. 



Potamogeton gramineus L. var. graminifoliits Fries. 



Frequent in shallow bays of Lake Izabal, about the islands in the Golfete 

 and in the Rio Dulce. Lake Izabal, 12078, 12081; Golfete, 12083, 12084; 

 Rio Dulce, 12082. 



Potamogeton nodosus Poir. 



Local in the Golfete and Rio Dulce. Rio Dulce, 12080, 12085. 



Potamogeton pusillus L. 



Shallow lakes and sluggish streams. In spring-fed pond, 8000 ft. eleva- 

 tion, Quiche, 12005; Lake Atitlan, 12069; Rio Dulce, 12086, 12079. 



Ruppia maritima L. 



Abundant in the Rio Dulce; local in Lake Atitlan. Rio Dulce, 12072a; 

 12624; Lake Atitlan, 12067, 12071, 12076. 



ALISMACEAE 



Echinodorus macrophyllus (Kunth.) Micheli. 



In shallow water, sloughs and marshes along the Rio Motagua and Rio 



Dulce. Quirigua, 12065. 

 Sagittaria lancifolia L. 



In shallow water and marshes along the Rio Polochic, Rio Dulce, Rio 



Motagua and Golfete. Panzos, 12060. 



