144 THE PLANT LIFE OF MARYLAND 



Rosa canina L. Dog Rose. 



Midland and Mountain Zones; in open situations; frequent. 

 Allegany County, near Cumberland (876). 



POMACEAE. 



Sorbus americana Marsh. Mountain Ash. 



Confined to the Mountain Zone; in swamps and on rocky slopes; frequent. 

 Garrett County, near S wanton (2009). 



Aronia arbutifolia (L.) Ell. Red Choke-berry. 



Throughout the state; in moist forests and swamps; common. 



Aronia atropurpurea Britton. 



Mountain Zone; in open wet situations. 

 Garrett County, Big Savage Mountain (S52). 



Aronia nigra (Willd.) Britton. Black Choke-berry. 



Mountain Zone; in swamps and bogs; frequent. 

 Garrett County, Thayerville ( 2054 I . 



Amelanchier canadensis (L.) Medic. June-berry. 



Coastal and Midland Zones; in dry forests, preferring rocky slopes and 

 being most common in the Midland Zone. 



Crataegus crus-galli L. Cockspur Thorn. 



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



Crataegus coccinea L. Scarlet Haw. 



Upper Midland District. 



Crataegus brownii Britton. 



Allegany County, Cumberland (875). 



Crataegus punctata Jacq. 



Allegany County, Braddock Run (903). 



Crataegus oxyacantha L. Hawthorn. 



Throughout the state; in open situations; being most common in the 

 Mountain Zone. Introduced from Europe. 



Crataegus tenuifolia Britton. 



Allegany County near Flintstone (1021). 



Crataegus unifiora Muench. Dwarf Thorn. 



Coastal Zone; in dry forests, preferring sandy soil; infrequent. 



DRUPACEAE. 



Prunus pennsylvanica L. f. Wild Red Cherry. 



Throughout the state; usually growing as single trees in open situations; 

 frequent. 



Prunus serotina Ehrh. Wild Black Cherry. 



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



