An Ecological Study of Buckeye Lake. 47 



Bidens trichosperma shows its brilliant yellow flowers at 

 the margin of several of the smaller islands and with B. comosa 

 is quite adimdant on the long south lobe of the island. Roripa 

 palustris is another plant which grows on exposed points or 

 old root masses in the shallow water. Roripa americana and 

 Cardamine bulbosa are frequent in the wetter portions of the 

 more shaded border. Galium trifidum, G. asprellum, Scutellaria 

 lateriflora and Campanula aparinoides are closely associated, 

 especially on the long southern lobe. The tall panicled inflores- 

 cence and large leaves of Rumex brittanica are conspicuous 

 features of the border where the water level is high. 



Another plant growing in the water or at the margin of 

 the island among Hibiscus and Typha is Polygonum emersum, 

 an extremely abundant amphibian in the lake. Eleocharis acicu- 

 laris forms a thick mat over small areas of exposed peat, on 

 old root masses and often on the mud at the entrance to paths. 



The following species are present in small numbers in 

 often but one locality or they may be found scattered sparingly 

 thru the swamp zone, sometimes they are even fairly abundant 

 but not strikingly so. Sagittaria latifolia, Rumex verticillatus, 

 Boehmeria cylindrica, Polygonum acre, P. cicutaefolium, Gerar- 

 dia paupercula, Comarum palustre, Viola blanda, Carex decom- 

 posita, C. pseudo-cyperus, C. comosa, C. stipata, C. alata, C. 

 vulpinoidea, Scirpus fluviatilis. Cyperus erythrorhizos, C. 

 strigosus, Echinochloa walteri, Homalocenchrus oryzoides, Muhl- 

 enbergia racemosa, Calamagrostis canadensis, Panicularia ner- 

 vata, Eragrostis hypnoides. 



Typha angustifolia which normally grows in deeper water 

 than at the very margin of the peat shelf, occurs in two situa- 

 tions at the margin of small islands forming the eastern portion 

 of the bog. 



Scirpus lactistris is wanting at the margin but there is a 

 thin growth in small, shallow depressions in the bog-meadow. 



Of the seventeen species of grasses and sedges which oc- 

 cur in the marsh zone, none are present in sufficient abundance 

 to lend character to the zone. The majority are found as isolated 



