480 Bicknell : Ferns and flowering plants of Nantucket 



longer and more conic tubercle. The sheaths in E. glaucescens 

 are less striate than in E. palustris, the lower ones more shining 

 and of a brighter purplish red color, the upper one much less 

 oblique at the top, sometimes even quite truncate, and the cortex 

 of the culm under a lens much more distinctly crystalline-punc- 

 ticulate and more coarsely cellular. The anthers and stigmas of 

 E. palustris are definitely longer and more slender than those of 

 E. glaucescens. These observations were made by comparison of 

 living plants on Nantucket and are confirmed by fresh specimens 

 from Long Island also and by some general reference to herbarium 

 material. 



Eleocharis acicularis (L.) R. & S. 



Frequent or common in wet places. In full flower in August 

 and September ; not observed in June. 



* Eleocharis tricostata Torr. 



Almanac Pond, Sept. 19, 1907 — a considerable growth on 

 the muddy shore, where the water had receded, the culms and 

 spikelets in all stages of development from their earliest visible 

 condition up to full maturity. A few yards away a dense growth 



ce, on June 18, 

 but E. tricostata 



of Eleocharis palustris covered the muddy level, bi 

 were not found intermingling. At the same pi: 

 was an abundance of E. palustris in full flower, 

 was not sufficiently advanced to be recognizable. 



Eleocharis tenuis (VVilld.) Schultes. 



Abundant in low grounds. In full flower June 7 ; completely 

 dried up in August. 



* Eleocharis rostellata Torr. 



Abundant in salt marshes on Swain's Neck and ^° m ^ 

 shores of Bache's Harbor ; also brackish marshes at Eat re. 

 Heads dried in August. 



Scirpus nanus Spreng. . 



Abundant in brackish mud about ponds on the south s ore, 



shores of Hummock Pond Snikes iust aDoearing June 1 7- 



shores of Hummock Pond. 



Scirpus americanus Pers. 



Very common on shores and in wet places generally. J 

 rer June 7. 



in 



