126 MIDDLESEX FLORA. 



Stipa, L. 

 S. avenacea, L. Black Oat Grass. 

 Medford (Wm. Boott) ; Maiden (R. Frohock) ; Wakefield (F. S. 

 Collins). Scarce. 



Ortzopsis, Michx. Mountain Eice. 



O. melanocarpa, Muhl. 



Melrose (Wm. Boott; specimen in herb. of). Rare. 

 O. asperifolia, Michx. 



Melrose (Dr. C. W. Swan) ; Winchester (Wm. Boott) ; Wilmington 



(F. S. Collins). Scarce. 

 O. Canadensis, Torr. 



Chelmsford, Woburn, Concord, Sudbury, et al. Not common. 



MuHLENBERGiA, Schreb. Drop-seed Grass. 



M. sobolifera, Trin. 



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



Walthara (B. D. Greene). Not common. 

 M. glomerata, Trin. 



Woburn and Bedford (Dr. 0. W. Swan) ; Concord (E. S. Hoar) ; 



Tewksbury and Belmont (Wm. Boott). Not common. 

 M. Mexicana, Trin. 



Rather common. 

 M. sylvatica, Torr. & Gray. 



Maiden, Arlington, Tewksbury, Dracut, et al. 

 M. Willdenovii, Trin. 



Lowell, Tewksbury, Dracut (Dr. C. W. Swan) ; Melrose, rare (H. 



A. Young) ; Waltham List; Newton (Wm. Boott). 



Brachyelytrdm, Beauv. 



B. aristatum, Beauv. 

 Ashby, Lowell, Framingham, Concord, et al. Not uncommon. 



Phleum, L. 



P. pratensb, L. Timothy. Herds' Grass. 

 Common. Nat. from Eu. 



Sporobolus, R. Br. 



S. cryptandrus, Gray. 



Lowell and Dracut (Dr. C. W. Swan) ; Winchester (C. E. Perkins). 



Scarce. 

 S. serotinus, Gray. 



Common in low meadows. 

 S. asper, Kunth. (Vilfa aspera, Beauv., Man.) 



Somerville (C E. Perkins) ; Medford (F. S. Collins). 



