45-i THE PLANT LIFE OF MARYLAND 



ACERACEAE. 



Acer saccharinum L. Silver Maple. 



Rare in the Coastal Zone; common in the Midland Zone; absent from the 

 Mountain Zone; one of the most abundant and characteristic trees in 

 flood plains and along streams. 



Acer rubrum L. Red Maple, Swamp Maple. 



Throughout the state; is most common in the Coastal Zone, where it is 



one of the characteristics trees of stream swamps and upland swamps, 



and frequent in upland forests; is less frequent in the Midland Zone, 



and in the Mountain Zone is nearly confined to moist sandy soil. 



Acer saccharum Marsh. Sugar Maple, Rock Maple. 



Midland and Mountain Zones; being one of the characteristic trees of 

 the lower slopes of the mountain ridges; infrequent in the Lower Mid- 

 land District. 



Acer nigrum Michx. Black Sugar Maple. 



Midland and Mountain Zones; on rocky slopes and cliffs; infrequent. 

 Frederick County, Thurmont (1755) 



Acer pennsylvanicum L. Striped Maple, Goosefoot Maple. 



Mountain Zone; in moist and dry forests of mountain slopes; frequent. 

 Allegany County, near Cumberland (870). 



Acer spicatum Lam. Mountain Maple. 



Upper Midland District and Mountain Zone; on rocky slopes and cliffs; 



infrequent. 

 Garrett County, near S wanton (498). 



Acer negundo L. Box Elder. 



Rare in the Coastal Zone, along streams in Anne Arundel and Prince 

 George's counties; frequent in the Midland Zone in flood plains; appar- 

 ently absent from the Mountain Zone. 



BALSAMINACEAE. 



Impatiens biflora Walt. Spotted Touch-me-not. 



Throughout the state; in moist forests, swamps, fresh marshes and other 

 open wet situations; common. 



Impatiens aurea Muhl. Pale Touch-me-not. 



Midland and Mountain Zones; in flood plains and along streams; fre- 

 quent. 



RHAMNACEAE. 



Rhamnus frangula L. Alder Buckthorn. 



Baltimore County, Pikesville (B. W. Barton). 



Ceanothus americanus L. New Jersey Tea. 



Coastal and Midland Zones; in dry forests and thickets; common. 



