92 MIDDLESEX FLORA. 



PAPaETAEiA, Tourn. 



*P. Pennsylvanica, Muhl. Pellitory. 



Concord (Minot Pratt). This plant is out of its usual range, and 

 may possibly have been introduced by accident with other plants. 

 June-Aug. 



Cannabis, Tourn. 



C. SATivA, L. Hemp. 

 Eather common. July- Aug. Nat. from Eu. 



HUMULUS, L. 



H. LuruLus, L. Hop. 



Sparingly naturalized from the West. July. 



PLATAN ACE7E. PLANE-TREE FAMILY. 



Platanus, L. 



p. occidentalis, L- Sycamore. Buttonwood. 

 Rather common. May-June. 



JUGLANDACEy^E. WALNUT FAMILY. 



JUGLANS, L. 



J. cinerea, L. Butternut. 

 Common. May. 



Carta, Nutt. 



C. alba, Nutt. Shagbark Hickory. 



Common. May-June. 

 C. tomentosa, Nutt. Mocker-nut. White-heart Hickory. 



Not uncommon. May-June. 

 C. porcina, Nutt. Pignut or Brown Hickory. 



Common. May- June. 

 C. amara, Nutt. Bitternut Hickory. 



Medford, Winchester, Belmont, et al. Less common than the other 



species. Maj^-June. 



CUPULIFER/E. OAK FAMILY. 



QUERCUS, L. 



Q. alba, L. White Oak. 



Common. May. 

 Q. bicolor, Willd. Swamp White Oak. 



Common, especially in the eastern sectipn of the county. May. 



