An Ecological Study of Buckeye Lake. 113 



C. retroflexa Muhl. Thicket, Cranberry Island ; and woods at 



margin of lake. 

 C. sparganioides Muhl. Woods at margin of lake. 

 C. interior Bailey. Abundant and widely distributed in the shrub 



and forest zones and at margin of bog-meadow, Cranberry 



Island, and other wooded islands. 

 C. tribuloides Wahl. A very common species in wet situations on 



the borders of the lake and islands. 

 C. alata Torr. Two situations on Cranberry Island, at the water's 



edge on the extreme southern lobe and at the edge of a pool 



in the thicket on the east side. 



Araceae. 



Peltandra virginica (L.) Kunth. In the marsh zone associated 

 with Typha and Decodon of the shore and various islands 

 and also alone or associated with Pontederia cordata or 

 Bidens sp. in shallow water and on masses of peat. 



Lemnaceae. 



Spirodela polyrhiza (L.) Schleid. Widely distributed in the 

 shallow waters of the lake and in ponds in the islands. 



Lemna trisulca L. The most abundant and widely distributed 

 floating macrophyte, often completely filling shallow depres- 

 sions in Cranberry Island. 



L. minor L. Associated with Lemna trisulca in the ponds of 

 Cranberry Island and other shallow water. 



Wollfia Columbiana Karst. In several ponds in the thicket. Cran- 

 berry Island. 



W. punctata Griseb'. Associated with W. columbiana. Cranberry 

 Island. 



Wolffiella floridana (J. D. Sm.) Thomp. First discovered in 1906 

 in a small pool southeast side of bog-meadow at inner mar- 

 gin of thicket. Later in a larger marginal pool. 



