55 
Lythrum Hyssopifolia, ZL. 
Common 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, Z. (Sprkep LOOSESTRIFE.) 
Georgetown (Mrs. Horner). Scarce. Dr. Chas. Pickering con- 
sidered both Lythrums to be introduced species, at least in Essex 
county. 
Nesea verticillata, H. 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. 
CACTACEA. 
(Cactus FAMILY.) 
Opuntia vulgaris, Mill. (Prickty Pear.) 
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. 

CUCURBITACER. 
(GOURD FAMILY.) 
Sicyos angulatus, Z. (SrTar CucUMBER.) 
A weed in waste places. 
Echinocystis lobata, Torr & Gray. 
Cultivated, and often escaped. Probably introduced from farther 
west. 
UMBELLIFERA. 
(PaRSLEY FaMILy.) 
Hydrocotyle Americana, L. 
Common in damp wood-paths. 
Hydrocotyle umbellata, L. 
Chebacco and some other ponds, not flowering abundantly ; usually 
found growing under water, flowering as the water recedes. 
