Nov., 1910.] A Floristic Survey of Orchard Island. 



203 



forming at the outer margin of the zone as dense a growth as the 

 Nelmnbo. Towards the inner margin the Nelumbo is 2 feet tall 

 and fruiting freely. 



A short distance west of the belt studied the Polygonum has 

 entirely outdistanced the Nelumbo, replacing society one with 

 a Polygonum zone external to a mixed Polygonum-Nelumbo zone. 



Fig. 2. View farther west than Fig. i. Polygonum emersum forms 

 the outermost zone, then follow zones or societies 2, 3, 4, 5, 6 and 7 of 

 map. 



Of the secondary species Brachythecium rivulare is the most 

 abundant, especially on the exposed mud surface, quite large 

 patches of which are covered by a pure growth of the moss. The 

 Riccias are also conspicuous members of the ground cover. The 

 herbs are very sparse. 



Towards the west of the median line of the belt is 



3. A Polygonum-Nelumbo-Typha society. 

 Facies. 



Polygonum emersum. 

 Nelumbo lutea. 



Typha latifolia. 



