112 MIDDLESEX FLORA. 



C. fillculmis, Vahl. 



Common. 



DULICHIUM, Richard. 



D. spathaceum ; Pers. 



Common. 



FUIRENA, Rottb. 



F. squarrosa, Michx. UMBRELLA GRASS. 

 Round Pond, Tewksbury (Wm. Boott; specimen in herb. of). 



ELEOCHARIS, R. Br. SPIKE-RUSH. 



E. Robbinsii, Oakes. 



Flat Pond, Groton (Dr. C. W. Swan) ; Tewksbury and Spot Pond r 

 Stoneham (Wm. Boott); Ashland (Rev. Thos. Morong). Not 

 common. 



E. tuberculosa, R. Br. 



Tewksbury (B. D. Greene) ; Wilmington (H. A. Young) ; Bedford 

 (Dr. C. W. Swan). Rare. 



E. obtusa, Schult. 

 Maiden, Winchester, Concord, et al. Not uncommon. 



E. Engelmanni, Steud. 

 Pine Hill, Medford, Aug. 19, 1880 (C. W. Swan). 



E. Engelmanni, Steud., var. detonsa, Gray. 

 Winter Pond, Winchester, Aug. 23, 1878 (E. H. Hitchings). At 

 the same locality, Aug., 1884, a proliferous form, in dense heads of 

 aggregated spikes and entirely asexual; associated closely with 

 the variety (C. W. Jenks). 



E. olivacea, Torr. 



Tewksbury (B. D. Greene) ; Medford (Wm. Boott) ; Melrose (H. 



A. Young) ; Littleton (L. L. Dame). Not common. 

 E. palustris, R. Br. 



Common. 



E. rostellata, Torr. 

 Medford (Wm. Boott; F. S. Collins). 



E. tenuis, Schult. 



Common. 

 E. acicularis, R. Br. 



Common. 

 E. pygmsea, Torr. 



Spot Pond, Stoneham (L. H. Bailey, Jr.) ; Medford (Wm. Boott) ; 



Watertown (F. S. Collins). Not common. 



