1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 



199 



(Gray Herb.); Horn Pond, 11 July, 1G September, 1867, 

 Boott (Mo. Bot. Gard. Herb, and Gray Herb.) ; Waushakum 

 Pond, So. Framingham, 29 June, 20 July, 1890, Sturtevant 

 (Mo. Bot. Gard. Herb.); sandy bottom, Lake Attitash, 

 Amesbury, August, September, 1895, Eaton (Mo. Bot. Gard. 



Herb.. U. S. Nat. Herb., and 



Minn. Herb.) ; Q 



naponit Lake, Wakefield, 10 September, 1869, Boott (N. 

 Y. Bot. Gard. Herb.); Attitash, Essex Co., Eaton 960 (Mo. 

 Bot. Gard. Herb.); same, 27 June, 1896, Eaton 197 (Mo. 

 Bot. Gard. Herb.) ; same, 31 July, 1896, Eaton 382 (Mo. 

 Bot. Gard. Herb.) ; Chebacco Pond, Essex Co., 15 July, 1896, 

 Dodge (N. Y. Bot. Gard. Herb.) ; Chebacco Lake, Essex Co., 



Gard. Herb, and Univ 



Herb 



same, without date. Eaton 



(Mo. Bot. Gard 



1896, Dodge 



Herb.) ; Chebacco Lake, Essex Co., 18 July, 1896, 

 (Gray Herb.); Bate's Pond, Wenham, 29 July, 1896, Eaton 

 376 (Mo. Bot. Gard. Herb.); Nine-Mile Pond, Cape Cod 

 4 September, 1898, Greenman 424 (Mo. Bot. Gard. Herb.) ; 

 Watson's Pond, Taunton, 15 September, 1903, Eaton (Mo 



) ; Winneconnet Pond, Norton, 14 July 

 Bot. Gard. Herb.) : Merrimac River, New- 



Bot. Gard. Herb 



buryport, August, 1896, Dodge 



Y. Bot. Gard. Herb 



fresh water, tidal shores Merrimac R 



Eato 



(M 



Bot. Gard. Herb 



Kimball's Pond. Ames 



bury, July 



1896, 



and 



Au 



1897, 



Bot. Gard. Herb 



Kimball 



Pond 



Eaton 

 Amesbury 



27 



June, 

 Pond, 

 Gard. Herb. ) 



1896, Eaton (U 



Co 



13 Au 



Minn. Herb.) 

 , 1899, Eaton 



Kimball 



(M 



Bot. 



near Jerry's 



Pond 



West 



Sey 



Tisbury 

 •7 (Graj 



Herb.) ; Lake Cochichewick, North Andover, 24 September 

 1903, Pease 2640 (Gray Herb.) ; submerged in shallow water 

 sandy margin of Great Pond, Weymouth, Norfolk Co., 

 September, 1918, Churchill (Mo. Bot. Gard. Herb.) ; car- 



Q 



dy bottom of Spectacle Pond, Wellfleet, 

 September, 1918, Fernald & Weatherby 



(Gray Herb 



d Mo. Bot. Gard. Herb 



dy bottom 



Great Pond, Weymouth, 2 September, 1918, K 

 Bot. Gard. Herb, and Gray Herb.) ; Buck P( 

 wet sandy lower beach and inundated margi 



Harwich 



