112 MIDDLESEX FLOEA. 



C. filiculmis, Vahl. 

 Common. 



DuLiCHiUM, Richard. 



D. spathaceuiTi; Pers. 



Common. 



FuiHENA, Eottb. 



F. squarrosa, Michx. Umbrella Grass. 

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



Eleochakis, K. Br. Spike-Rush. 



E. Robbinsii, Oakes. 



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

 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). Bare. 



E, obtusa, Schult. 

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



E. Engelmanni, Stend. 

 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, B. Br. 



Comm'^n. 



E. rostellata, Torr. 

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



E. tenuis, Schult. 

 Common. 



E. aclcularis, R. Br. 



Common. 

 E. pygmaea, Torr. 

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

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



