92 MIDDLESEX FLORA. 



Parietaeia, Tourn. 



*P. Pennsylvanica, Muhl. Pellitoet. 

 ConQord (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. SATiTA, L. Hemp. 

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



Hdmulus, L. 

 H. LUPDLDS, L. Hop. 



Sparingly naturalized from the West. July. 



PLATANACEyE. PLANE-TREE FAMILY. 



Platanus, L. 



P. occidentalis, L. Sycamore. Btjttonwood. 

 Rather common. May-June. 



JUGLANDACEvE. 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 Hickoet. 



Not uncommon. May-June. 

 C. porcina, Nutt. Pignut or Brown Hickory. 



Common. May- June. 

 C. amara, Nutt. Bitternut Hickory. 



Medf ord, Winchester, Belmont, et al. Less common than the other 



species. May-June. 



CUPULIFER.^. OAK FAMILY. 



Queecus, L. 



Q. alba, L. White Oak. 



Common. May. 

 Q. bicolor, Willd. Swamp White Oak. 



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



