72 



Avciia striata, Mx. " N. N. E., N. Y. and northwest." In N. Pa. 

 Phragmitcs communis, Trin. " Edges of ponds." Along the 



coast and the Great Lakes, but not elsewhere. 

 Glyccria eloiigata, Tnn. " N. E. to Mich., Minn. &c., Roan 



Mtn., N. Car." Common in the mountains of Pa. 

 Glyceria grandis, Wats. N. E. to N. Y., Mich, and Minn." N. 



E. Pa., rather frequent. 

 Lycopodium Selago, L. " Mtn. tops, Me. to L. Sup. and N. 



Summit of the Blue Mtn., Del. Water Gap., Pa. 



M 



iplcx, Hitchcock. ** M 



>» 



Mt 



Pellcza gracilis, Hook. " Mass. to Minn, and N." SulHvan Co., 



Pa. (C. E. 



Eq 



r odium palmatjnn, Sw. " Mass. to Va., Ky. and sparingly 

 south." Abundant on the Pocono plateau, N. E. Pa. 

 tisctum littorale, Kuhlcwein." Vt. and N. Y. and N." Com- 

 mon along the shores of the Suscjuehanna river, Pa., down to 

 Chesapeake Bay 



Equisetnm variegaium, Schleich. " N. H. and Niagara." Pres- 



que Isle, P>ie Pa. 

 On the other hand, 



J 



Pa., whose existence within their borders is open to challenge. 

 Some years ago a list of twenty such was sent to a botanical 

 friend in Cambridge, who carefully examined the Harvard Herb- 

 arium, without meeting one of them represented by a specimen 

 from these States. 



Another manifest defect is the inaccurate designation of ad- 

 ventive and naturalized species. That an introduced plant 

 might not behave in the same way in all parts of the vast terri- 

 tory so diverse in soil and climate does not seem to have been 

 apprehended. Over a whole state or several states, or, under 

 favorable circumstances, even at a single station, some may take 

 hold and become established, and in the rest 6f the territory be 

 either unknown, or very precarious in their tenure. Both these 

 things deserve to be noted. And yet, it can be easily shown 

 that not one, or two, but a considerable number, marked as 

 adventives in this new Manual, are thoroughly naturalized in 

 extensive districts outside of New England. 



