A CONTRIBUTION TO THE FLORA OF THK COUNTY. 23I 



var. aquatic urn Sanio. 



Kelvedon (8) ! 

 Group Kneiffii Ren. 



N. Essex (14) ; Loughton Forest (13). 

 var. polycavpon Bland. 



Norton Heath ! ! 

 var. intermedium Schimp. 



Norton Heath ! ! 

 Group pseudofluitans Sanio. 

 var. patemum Sanio. 



Kelvedon (8) ! ; High Easter ! ! 



H. fluitans Linn. 



The following in the absence of specimens cannot be 

 placed ; some may belong to the next species. 

 Thomas Warner's gravel pit in the Forest near 

 Woodford Row (2) ; "pond in Greenleaves Lane," 

 Walthamstow (2) ; in Walthamstow Marshes (2) ; nr. 

 Chelmsford (7) ; N. Essex (14) ; Saffron Walden (9). 

 Group Ampliibium Ren. 

 var. jeanbernati Ren. 



Loughton ! ! ; Warley Common ! ! 



H. exannulatum Gumb. 



"Scarce, Epping Forest " (11). 



Group Typicum Ren. 



var. pinnatum Boul. 



Cuckoo Pits, Chingford ! ! ; Tiptree Heath (8) ! 



var. pinnatum forma stenophylloides Ren. 



Epping Forest in a gravel pit (11) !; Epping Forest 

 (19) ; nr. the Earl's Path, High Beach ! ! ; nr. the 

 Rising Sun, Walthamstow! !; Norton Heath ! ! ; Mill 

 Green Common (approaching the var. brachydictyon. 

 — J.A.W.) ! ! 



var. brachydictyon Ren. 



Norton Heath ! ! ; Galley wood Common (8) ! ! ; West 

 Bergholt Heath (an extreme form diverging strongly 

 towards var. pinnatum, due to the less alpine habitat. 

 J.A.W.) (8) ! 



var. molluscum Sanio. 



Leyton, Epping Forest ! ! 



