198 IOWA ACADEMY OF SCIENCES. 



Ammannia Latifolia, L. Myers (101). Salt or brackish 

 marshes amonj? the grasses and rushes More or less 

 succulent. 



Ammamnia Humilis, Michx. Myers (102). Moist, sandy soil 

 near river. 



Lythrum Alatum, Pursh. Myers (103). Border of flatwood 

 ponds in clumps of grasses near bayhead. 



Lythrum Lineare, L. Myers (104). Salt marshes among 

 the grasses. Fowers white. 



Proserpinaca Palustris, L. Myers (93). Borders of flat- 

 wood ponds. 



Proserpinaca Pectinacea, Lam. Myers (92). Borders of 

 flatwood ponds, often in shallow water. 



Myriophyllum Heterophyllum, Michx. Myers (91). Per- 

 manent ponds in flatwoods in about three feet of water. 



Gaura Angustifolia, Michx. Myers (123), Sanibel. Flat- 

 woods and sandy prairies. 



JussiAEA Peruviana, L. Myers (122). Habitat and size 

 similar to (121). 



JussiAEA PiLosA, HBK. Mycrs (121). Along ditches and 

 near freshwater marshes. Plant erect, four to six feet 

 high. 



Ludwigia Virgata, Michx. Myers (120), Marco. Flat- 

 woods. 



LuDWiGiA LiNiFOLiA, Poir. Myers (119). Wet weather 

 ponds in flatwoods, growing in the water. Plant erect 

 wuth runners or offsets beneath the surface of the 

 water. 



LuDWiGiA Capitata, Michx. Myers (118). Flatwood ponds,, 

 mostly in the water. 



LuDWiGiA Alata, Ell. Myers (113). Along streams in rich 

 soil and along edge of sphagnum bog. 



Ludwigia Microcarpa, Michx. Myers (117). Border of 

 flatwood ponds. 



Ludwigia Palustris, Myers (114), (551). Near streams in 

 high grass, forming a dense mat, the prostrate stems 

 rooting at the nodes, No. 114, in new soil near river. 



