94 



EUPHORBIACE^, 



(Spurge Family.) 



Euphorbia polygonifolia, L. 



Beaches, in sand, from Nahant to Salisbury, and Plum Island. 

 Euphorbia maeulata, X. 



Dry places, etc. A common weed. 

 Euphorbia hyperieifolia, L. 



"Kenoza," Haverhill, 1875 (J. R.) ; and one or two other localities. 

 Euphorbia marginata, Pursh. 



A native of Kansas and Nebraska. Frequently cultivated, escaping 



from gardens occasionally. 

 Euphorbia Esula, L. 



Very abundant near Newburyport on the line of the Eastern R. R. 



(Nat. from Eu.) This is probably Oakes's locality. The E. Esula 



in Tracy's Lynn Flora is probably, the next species which is the 



common one in the southern portion of the county. 

 Euphorbia Cyparissias, X. 



Very common in the older places where it has escaped from gardens. 



(Nat. from Eu.) 



Acalypha Virginica, X. (Threb-sbeded Mercury.) 

 "Yards and rubbish heaps in Lynn (Tracy); Chebacco, Boxford, 

 ,etc. Frequently varies greatly in size, small forms being only a 

 few inches high, while others are quite fifteen. 



URTICACEiE. 



(Nettle Family.) 



Ulmus fulva, Miehx. (Slippery Elm.) 



Boxford (J. H. Sears), Georgetown (Mrs. Horner), Wenham. 



Apparently Indigenous, although scarce. 

 Ulmus Americana, X. (American or White Elm.) 



Common as a shade tree and very freely reproduced by seeds. 



Celtis occidentalis, X. (Nettlb-trbe ; Hackberry.) 

 The only specimens of this species, now known to the writer, are at 

 the summit of one of the dunes on Plum Island, and between Salem 

 and Lynn In the Great Pastures. There are specimens from the 

 county in the P. A. S. herbarium from Ipswich collected by the late 

 Mr. Oakes, and Mr. S. P. Fowler remembers a tree in Topsfield, 

 which has since been cut down. There are also four trees of this 

 species on the farm of Mr. Towns, at Boxford, which were raised 

 from seeds obtained at Lowell, about 1840. 



