[Vol. 9 

 166 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



(Mo. Bot. Gard. Herb, and Gray Herb.) ; Small Round Pond, 

 Woburn, 29 September, 1867, Boott (Mo. Bot. Gard. Herb.) ; 

 Small Round Pond, Woburn, 11 August, 1867, Boott (Mo. 

 Bot. Gard. Herb, and Gray Herb.) ; Small Round Pond, 

 Woburn, 20 October, 1867, Boott (Mo. Bot. Gard. Herb.); 

 Small Round Pond, Woburn, 9 June, 1867, Boott (Mo. Bot. 

 Gard. Herb.) ; Small Round Pond, Woburn, 2 September, 



1866, Boott (Mo. Bot. Gard. Herb, and Gray Herb.) ; Small 

 Round Pond, Woburn, 18 September, 1866, Boott (Mo. Bot. 

 Gard. Herb., Gray Herb., and N. Y. Bot. Gard. Herb.); 

 Small Round Pond, Woburn, 14 July, 1867, Boott (Mo. 

 Bot. Gard. Herb.); Small Round Pond, Woburn, 15 & 22 

 August, 1869, Boott (Gray Herb.); Mystic Pond, without 

 date, C.E. Faxon (Gray Herb.); Mystic Pond, 6 August, 

 1865, Boott (Mo. Bot. Gard. Herb, and Gray Herb.); 

 Mystic Pond, 30 July, 1865, Boott (Gray Herb.); 

 Mystic Pond, 2 September, 1866, Boott (Mo. Bot. 

 Gard. Herb.); Mystic Pond, 3 September, 1866, Boott 

 (Gray Herb.); Mystic Pond, 14 June, 1867, Boott 

 (Mo. Bot. Gard. Herb.); Mystic Pond, Medford, 

 without date, Boott (Gray Herb.); pond in Woburn, 

 without date, Davenport (Gray Herb.); Mystic Pond, 

 29 August, 1869, Boott (N. Y. Bot. Gard. Herb.) ; Sherman's 

 Pond, Waltham, 31 August, 1869, Boott (N. Y. Bot. Gard 

 Herb.) ; Spot Pond, Stoneham, 19 August, 1899, Rich (Gray 

 Herb.); Spot Pond, Stoneham, without date, Collins (Gray 

 Herb.); Skug River, North Reading, 14 September, 1903, 

 Pease 2670 (Gray Herb.) ; submerged in running water, 

 Ashland, 17 July, 1879, Morong (N. Y. Bot. Gard. Herb.): 

 Nutting Pond, Billerica, 11 August, 1869, Boott (N. Y. Bot. 

 Gard. Herb.); sandy margin of Heard's Pond, Wayland, 10 

 September, 1909, Fernald (Gray Herb.) ; Mystic Pond, near 

 Bacon's, 10 September, 1876, Boott (N. Y. Bot. Gard. 

 Herb.); Mystic Pond at Grover, 29 August, 1869, Boott 

 (N. Y. Bot. Gard. Herb.); Mystic Pond, 29 August, 1882, 

 Perkins (Gray Herb.) ; Mystic Pond, 4 July, 1867, Boott 

 (Mo. Bot. Gard. Herb, and Gray Herb.) ; Mystic Pond, 1 

 September, 1867, Boott (Mo. Bot. Gard, Herb, and Gray 

 Herb.) ; brook above gas works, Arlington, 1 September, 



1867. Boott (Gray Herb.) ; Mystic Pond, mouth of Arling- 

 ton Brook, 30 July, 1864, Boott, (Mo. Bot. Gard. Herb, and 



