4.">_! THE PLANT LIFE OF MARYLAND 



Euphorbia ipecacuanhae L. Ipecac Spurge, Wild Ipecac. 



Coastal Zone; in dry forests and open situations, being most abundant on 



sandy soil; common. 

 Worcester County, Snow Hill (1045). 



Euphorbia darlingtonii A. Gray. Darlington's Spurge. 



Baltimore, Walbrook (Maud E. Safford). 



Euphorbia commutata Engelm. Tinted Spurge. 



Midland and Mountain Zones; in moist forests and flood plains, being 

 known only along the Potomac river. 



CALLITRICHACEAE. 



Callitriche austini Engelm. Water Starwort. 



Harford County. Edgewood (Robert K. Miller); Calvert County, Chesa- 

 peake Beach (Joseph H. Painter). 



Callitriche palustris L. 



Baltimore County, Gunpowder river (Robert K. Miller). 



Callitriche heterophylla Pursh. 



Throughout the state; in ponds and slow running streams; common. 

 Wicomico County, Shad Point (1181). 



LIMNANTHACEAE. 



Floerkea proserpinacoides Willd. False Mermaid. 



Midland Zone; in flood plain forests; rare. 



Baltimore County, Western Run (1395); Patapsco river, near Ellicott 

 City (W. S. Cooper). 



ANACARDIACEAE. 



Rhus copallina L. Black Sumac. 



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



Rhus hirta (L.) Sudw. Staghorn Sumac. 



Throughout the state; in dry forests and thickets; frequent. 



Rhus glabra L. Scarlet Sumac. 



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



Rhus aromatica Ait. Fragrant Sumac. 



Infrequent in the Upper Midland District in dry forests and open situa- 

 tions. 

 Washington County, Hancock (693). 



Rhus vernix L. Poison Sumac. 



Coastal and Midland Zones; in bogs and swamps; infrequent. 



Rhus radicans L. Poison Ivy. 



Throughout the state; in all sorts of situations; common. 



