24 Proceedings of the Ohio State Academy of Science. 



This is II. Typha association, comprising 5 societies as fol- 

 lows: 



1. Scirpus fliiviatilis society: This society alternates with 

 those of Association I and also forms quite a dense border at 

 the margin of the 



2. Typha-Sparganium society : The dominant species of 

 which are Typha latifolia and Sparganium eurycarpum. These 

 in deeper water are associated with Scirpus fluviatilis, Potamoge- 

 ton natans, P. lonchites, P. pectinatus with Lemna minor on 

 the surface of the water. The Typha-Sparganium zone extends 

 150 feet up-stream and to the west completely across the cove. 

 Along the inner portion of the zone the Potamogeton and Cas- 

 talia have disappeared and the society becomes a 



3. Typha-Homalocenchrus-Sparganium society: Homalo- 

 cenchrus oryzoides becoming one of the dominant members. 

 The ground is distinctly wet but is not completely covered with 

 water. The associated plants are Hibiscus moscheutos, Sagit- 

 taria latifolia, Rumex brittanica, Scirpus fluviatilis and Boeh- 

 meria cylindrica. This is bordered by a narrow (lO-foot wide at 

 ^.he widest) crescentric zone of a 



III Sedge Association consisting of : 



1. Homalocenchrus oryzoides society, with the associated 

 species of Sparganium eurycarpum, Sagittaria latifolia, Carex 

 sparganioides, C. frankii. Hibiscus moscheutos, Peltandra vir- 

 ginica, Rumex crispus, Solanum dulcamara. Slum cicutaefolium, 

 Cicuta bulbifera, Boehmeria cylindrica, Sciprus atrovirens. Con- 

 volvulus sepium, Oxalis cymosa, Panicularia nervata, Eupa- 

 torium perfoliatum, Mentha spicata abundant near the margin 

 of the creek. This zone lies along the creek between the Wil- 

 low and Typha zone. Near the head of the cove it merges into 

 a mixed one of a 



2. Homalocenchrus-Scirpus fluviatilis society which lies 

 between the broad Typha covered belt and the ruderals. 



Between the grass and sedge grass zones, i and 2, and the 

 marginal border of trees is a zone which is occupied by a ruderal 

 herb association composed of a variety of plants, several of which 



