MARYLAND WEATHER SERVICE 459 



CACTACEAE. 



Opuntia opuntia (L.) Prickly Pear. 



Apparently nearly confined to the Coastal Zone, where it is common in 



forests and open situations on sandy soil. 

 Caroline County, Federalsburg (1G34). 



THYMELEACEAE. 



Dirca palustris L. Moose-wood, Leather-wood. 



Midland and Mountain Zones; in moist forests; infrequent. 

 Montgomery County, Great Falls (Joseph H. Painter). 



LYTHRACEAE. 



Ammania koehnei Britton. 



Worcester County. Greenbackville (1109). 



Rotala ramosior (L.) Koehne. 



Apparently confined to the Coastal Zone; in moist open situations, pre- 

 ferring sand. 

 Worcester County, Wagram (1161); St. Mary's County. Piney Point 

 (M. A. Chrysler). 



Decodon verticillatus (L.) Ell. Swamp Loosestrife, Willow Herb. 



Throughout the state, being common in the Coastal Zone, and infrequent 

 in the Midland and Mountain Zones; in swamps and marshes and 

 about the margins of ponds. 



Lythrum alatum Pursh. Loosestrife. 



Montgomery County, Great Falls (Robert K. Miller). 



Lythrum lineare L. Loosestrife. 



Coastal Zone; in brackish marshes; common. 

 Talbot County, Skipton Creek (109). 



Lythrum salicaria L. Purple Loosestrife. 



Calvert County, fresh marshes of the Patuxent River (Robert K. Miller). 



Parsonsia petiolata (L.) Rusby. Tar-weed, Wax-weed. 



Throughout the state; in moist and dry open situations; common. 



MELASTOMACEAE. 



Rhexia mariana L. Meadow Beauty. 



Coastal and Midland Zones, being common in the former, infrequent in 



the later; in moist sandy situations. 

 Worcester County, Greenbackville (3119). 



Rhexia virginica L. Deer Grass. 



Coastal Zone; in moist sandy situations; frequent. 

 Talbot County, Easton (116). 



