MIDDLESEX FLORA. 91 



URTICACEi^. NETTLE FAMILY. 



Ulmtjs, L. 



U. fulva, Michx. SlippektElm. Red Elm. 



Concord (Walter Deane). Rare. Apr. 

 U. Americana, L. American Elm. White Elm. 



Common. Apr. 



Celtis, Tourn. 



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

 Hackbeeet. 

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



MOEUS, Tourn. 



M. rubra, L. Red Mtjlbeert. 



Sparingly spontaneous. May. 

 M. ALBA, L. White Mulbeeet. 



Occasional; N. Billerica, along the old Middlesex Canal, among 



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



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



Uetica, Tourn. 



U. gracilis. Ait. Nettle. 



Common. July-Aug. 

 Uktica dioica, L. 



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



TJ. UEENS, L. 



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

 Aug. Nat. from Eu. 



Lapoetea, 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. Richweed. Cleaeweed. 

 Rather common. July-Sept. 



BcEHMEEiA, Jacq. 



B. cylindrica, WUld. False Nettle. 

 Common. July-Aug. 



