478 THE PLANT LIFE OF MARYLAND 



Mentha rotundifolia (L.) Huds. Round-leaved Mint. 



Prince George's County, Beltsville (W. Ralph Jones). 



Mentha aquatica L. Water Mint. 



Coastal Zone; in wet open situations; locally abundant. Introduced 

 from Europe. 



Mentha sativa L. Marsh Whorled Mint. 



Prince George's County, Nottingham (Robert K. Miller). 



Collinsonia canadensis L. Citronella. 



Throughout the state; in moist forests; frequent. 



Perilla frutescens (L.) Britton. Perilla. 



Calvert County, Parkers Creek (M. A. Chrysler). 



SOLANACEAE. 



Physalodes physalodes (L.) Britton. Apple-of-Peru. 



Throughout the state; in waste places; infrequent. Introduced from 

 South America. 



Physalis pruinosa L. Tall Hairy Ground-Cherry. 



Baltimore County, Towson (Robert K. Miller). 



Physalis virginiana Mill. Virginia Ground-Cherry. 



Baltimore County, near Cockeysville (Robert K. Miller). 



Physalis heterophylla Nees. Ground Cherry. 



Throughout the state; in dry open situations; frequent. 

 Caroline County, Federalsburg (1624). 



Solanum nigrum L. Black Nightshade. 



Throughout the state; in cultivated grounds and waste places; common. 



Solanum carolinense L. Horse Nettle. 



Throughout the state; in waste situations; common. 



Solanum dulcamara L. Nightshade. 



Throughout the state; in moist waste situations; infrequent. Intro- 

 duced from Europe. 



Lycium vulgare (Ait. f.) Dunal. Matrimony Vine. 



Midland Zone; in waste situations; infrequent. Introduced from 



Europe. 

 Baltimore County, near Towson (Robert K. Miller). 



Datura stramonium L. Jimson Weed, Jamestown Weed. 



Throughout the state; in waste situations and cultivated grounds; 

 common. Introduced from Europe. 



Datura tatula L. Purple Jimson Weed. 



Baltimore, Forest Park (W. Ralph Jones). 



