64 T O R R E Y A 



Mariscus jamaicensis (Crantz) Britton. 



In shallow water along the Golfete and Rio Dulce. Rio Dulce, 12019. 

 S cir pus calif ornicus (Mey.) Britton. 



Local in shallow bays of lakes and Rio Dulce ; abundant about the islands 



in the Golfete. Lake Amatitlan, 12053,, 12054; Rio Dulce. 12018. 

 Scirpns citbensis Pers. 



In shallow water along shore of Rio Dulce and Golfete. Rio Dulce, 12020. 

 Scleria microcoria Nees. 



In marshes along Rio Polochic, Rio Dulce and the Golfete. Panzos, 12023. 

 Scleria I a ti folia Sw. 



Along shore of Golfete and in swamps between Puerto Barrios and Tene- 



dores. Golfete. 12023a. 



ARACEAE 



Pistia stratiotes L. 



The floating rosettes of spongy leaves form dense mats over the surface of 

 quiet water in ponds and streams. San Felipe. Lake Izabal, 12618 ; Rio 

 Dulce ; Rio Lampara ; "Section 4" between Puerto Barrios and Tenedores. 



POXTEDERIACEAE 



Hetcranthcra reniformis Ruiz, & Pav. 



In shallow water and along muddy flats of lakes, ponds and streams. Lake 

 Amatitlan, 12615 ; Coban, 12613 ; Puerto Barrios. 12614. 



Pontedcria cordata L. (P. rotundifolia) 



In shallow water and marshy shores of lakes and sluggish streams. Rio 

 Polochic, Panzos, 12622; Rio Dulce, 12623; Lake Izabal; Golfete; ponds 

 near Tenedores. 



JUXCACEAE 



Juncus effitsus L. 



In shallow pond and bordering marsh, Coban, 12043. 

 Juncus marginatus Rostk. 



In swamps, Rio Coban, Tactic, 12024. 



AMARYLLIDACEAE 



Hymenocallis littoralis (Jacq.) Salisb. 



In shallow water along the borders of mangrove swamps along the east 

 end of the Golfete and shores of the Rio Dulce, 12061. 



CERATOPHYLLACEAE 



Ceratophyllum demersum L. 



Widely distributed in shallow water. Lake Atitlan, 12608; San Felipe, Lake 

 Izabal 12609; Rio Dulce, 12610. 



NYMPHAEACEAE 



Cabomba aquatica Aubl. 



In shallow bays of lakes and streams. Lake Izabal, 12611; Rio Dulce y 

 12612; Golfete. 



