MIDDLESEX FLOKA. 91 



URTICACE>E. NETTLE FAMILY. 



ULMUS, L. 



U. fulva, Michx. SLIPPERY ELM. RED ELM. 



Concord (Walter Deane) . Rare. Apr. 

 U. Americana, L. AMERICAN ELM. WHITE ELM. 



Common. Apr. 



CELTIS, Tourn. 



C. occidentalis, L, including var. crassifolia. SUGARBERRY. 

 HACKBERRY. 

 Lowell, Emerson's Trees and Shrubs of Mass. Apr.-May. 



MORUS, Tourn. 



M. rubra, L. RED MULBERRY. 



Sparingly spontaneous. May. 

 M. ALBA, L. WHITE MULBERRY. 



Occasional; 1ST. Billerica, along the old Middlesex Canal, among 



wild shrubs, itself shrubby (Dr. C. W. Swan) ; Concord, several 



trees (Minot Pratt). May. Nat. from Eu. 



URTICA, Tourn. 



U. gracilis, Ait. NETTLE. 



Common. July- Aug. 

 URTICA DIOICA, L. 



Fence-row, Watertown (Walter Deane.) Nat. from Eu. 



U. URENS, L. 



Maiden (H. A. Young) ; Concord (Minot Pratt). Scarce. July- 

 Aug. Nat. from Eu. 



LAPORTEA, Gaudich. 



L. Canadensis, Gaudich. WOOD NETTLE. 

 Natick (Austin Bacon) ; Townsend (Dr. C. W. Swan) ; Belmont 

 (L. L. Dame). July- Aug. 



PILEA, Lindl. 



P. pumila, Gray. RICH WEED. CLEARWEED. 

 Rather common. July-Sept. 



BCEHMERIA, Jacq. 



B. cylindrica, Willd. FALSE NETTLE. 

 Common. July-Aug. 



