MIDDLESEX FLORA. 129 



DIPLACHNE, Beauv. 



D. imbricata, Scribn. 



Billerica, near woollen mills (Dr. C. W. Swan). Adv. from the 

 West. 



"Habit somewhat that of D. fascicularis, but the spikes are much 

 narrower, the spikelets being smaller, closely appressed and over- 

 lapping. In the shape of the lower palet they are very distinct ; 

 in place of the acute teeth and manifest awn of the other, the teeth 

 in this are minute and blunt, and the midnerve produced only as a 

 mere point." Bot. Cal. 



TRIPLASIS, Beauv. 



T. purpurea, Chapm. (Tricuspis purpurea, Gray, Man.) SAND 

 GRASS. 



Winchester (C. E. Perkins). 



PHRAGMITES, Trin. 



P. communis, Trin. KEED. 



Belmont (C. E. Perkins) ; Cambridge (Bigelow's PI. Bost.) ; Con- 

 cord (E. S. Hoar). Not common. 



EATONIA, Eaf. 



E. Obtusata, Gray. 



Concord (E. S. Hoar; specimen in herb, of) ; Watertown (Bigelow's 

 Fl. Bost., under Aira truncata, Muhl.) 

 E. Pennsylvanica, Gray. 



Medford and Maiden (Wm. Boott; specimen in herb, of) ; Concord 

 (E. S. Hoar). Not common. 



ERAGROSTIS, Beauv. 



E. major, Host. (E. poseoides, Beauv., var. megastachya, Gray, 



Man.) 



Lowell, " dumps " (Dr. C. W. Swan) ; Maiden (H. A. Young) ; 



Cambridge (P. S. Collins). Nat. from Eu. in some parts of the 



U. S., but adv. in the county. 

 E. minor, Host. (E. poaeoides, Beauv., Man.) 



Lowell, "dumps; " Westford, woollen mill yard (Dr. C. W. Swan). 



Introduced with the preceding. 

 E. pilosa, Beauv. 



Lowell, " dump " (Dr. C. W. Swan) ; Medford (Wm. Boott). Adv. 



from Eu. 

 E. PursMi, Schrad. 



Lowell, near cotton waste (Dr. C. W. Swan). Adv. from the South. 

 E. capillaris, Nees. 



Not uncommon. 



