All Ecological Study of Buckeye Lake. 47 



Bidens trichc)s])eniia shows its Ijrilliant yellow Howers at 

 the margin of several of the smaller islands and with 15. comosa 

 is qttite adundant on the long south lobe of the island. Roripa 

 palustris is another plant which grows on exposed ])oints or 

 old root masses in the shallow water. Rorij^a americana and 

 Cardamine bulbosa are frequent in the wetter portions of the 

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

 lateriflora and Campantila 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 fotind scattered sparingly 

 thrti the swam]) 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 i)alustre, 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, Panictdaria ner- 

 vata, Eragrostis hypnoides. 



Typha angustifolia which normally grows in (lee])er 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 lacustris 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 



