118 Proceedings of the Ohio State Academy of Science. 



P. persicaria L. Zone of ruderals, Lieb's Island. 



P. piinctatum Ell. (F. acre H. B. K.) In shrub zone and at 



margins of pools Cranberry Island; on mud fiats of other 



islands and the shore of lake. 

 P. hydropiperoides ]\Iichx. Thicket, Cranberry Island. 

 P. sagittatum L. Mud fiat of cove east of Summerland beach. 

 P. arifolium L. In mud at water's edge of shrub zone and margin 



of pools in the south side of Cranberry Island. 



Amaranthaceae. 



Amaranthus hybridus L. Small island north of Cranberry 

 Island, Polygonum-Scirpus society, Orchard Island. 



Acnida tamariscina (Nutt.) Wood. On mud of small island 

 north of Cranberry Island. 



Portulacaceae. 



Claytonia virginica L. Abundant in woods north of lake. 

 Portulaca oleracea L. Cultivated fields bordering the lake. 



Nymphaeaceae. 



Xymphaea advena Soland. Quite generally distributed in shallow 

 sequestered portions of the lake, most abundant in the 

 extreme northern and southern lobes ; two small clumps 

 stranded in Cranberry bog. 



Castalia tuberosa (Paine) Greene. Abimdant and widely dis- 

 tributed, often associated with Nelumbo lutea growing at a 

 depth of 5 feet. 



Nelumbo lutea (Willd.) Pers. The most conspicuous in point 

 of numbers, size and attractiveness of plant, fixed aquatic 

 in the lake. Covering large areas in water down to 5^ feet 

 deep in all portions of the lake except the extreme northern 

 lobe. 



Ceratophyllaceae. 



Ceratophyllum demersum L. Forms dense and extensive sub- 

 merged mats in ponds in the bog, in more or less protected 

 coves of the lake, and less copious along the shores of lake 

 and islands. 



