55 



Lythrum Hyssopifolla, L. 

 Commoa near the coast. Varying from small to very large forms, 

 some specimens being twenty-six inches high and much branched. 

 A few specimens found at Boxford, Aug. 1880, twelve miles inland. 



Lythrum Salicaria, L. (Spiked Looskstkifk.) 

 Georgetown (Mrs. Horner). Scarce. Dr. Chas. Pickering con- 

 sidered both Lythrums to be introduced species, at least in Essex 

 county. 



Ifessea verticillata, B. B. K. (Swamp Loosestrife.) 

 Common in wet places, and borders of ponds and streams. The 

 portions of the long branches which droop over into the water be- 

 come much enlarged by a corky outside tissue. 



CACTACE-ZB. 



(Cactus Family.) 



Opuntia vulgaris, Mill. (Pkickly Peak.) 

 Near "Kernwood" in Salem, some thirty years ago (Hugh Wilson) ; 

 also on the Ipswich river bank at North Reading, beyond Middleton ; 

 ■where a few plants were placed many years ago there is now a very 

 flourishing locality. The natural habitat of this species is from 

 Nantucket southward. 



CTJC"URBITACE.ai. 



(GotTRD Family.) 



Sicyos angulatus, L. (Star Cucumber.) 

 A weed in waste places. 



Eehinocystis lobata, Torr & Gray. 

 Cultivated, and often escaped. Probably introduced from farther 

 west. 



IIlVLBEI.LIFEK.a3, 



(Parsley Family.) 



Hydrocotyle Americana, L. 



Common in damp wood-paths. 



Hydrocotyle umtaellata, L. 



Chebacco and some other ponds, not flowering abundantly ; usually 

 found growing under water, flowering as the water I'ecedes. 



