426 THE PLANT LIFE OF MARYLAND 



Serpentine Barrens of the Lower Midland District; it is locally 

 common in sandy soil and on thin rocky slopes throughout the Coastal 

 and Midland Zones, being least frequent in the Upper Midland 

 District. 



Quercus nigra L. Water Oak. 



Confined to the Southern Eastern Shore where it has not been observed 

 north of Greensborough, Caroline County; it is most abundant in 

 sandy-loam upland swamps and in flood plains with sandy soil, is 

 infrequent in clay upland and in well-drained sandy soils. 



Worcester County, near Berlin (656). 



Quercus phellos L. Willow Oak. 



Throughout the Coastal Zone and beyond the "Pall-line" along the 



Potomac River as far as Seneca Creek; is infrequent in river swamps 



and stream swamps, common in upland swamps and flood plains and 



in clay upland, frequent in sandy-loam upland. 



Quercus imbricaria Michx. Shingle Oak. 



Confined to the vicinity of Barnesville, Gaithersburg and Great Falls in 

 Montgomery County, and Zekiah Swamp in Charles County. 



Quercus alba L. White Oak. 



Throughout the state, being the commonest of the oaks and one of the 



commonest forest trees; it grows in swamps and on the upland in 



soils of every character in every county of the state, attaining its best 



development in the deep well-drained upland soils. 



Quercus minor (Marsh.) Sarg. Post Oak, Iron Oak. 



Coastal and Midland Zones, apparently absent from the Mountain Zone; 



frequent in the Coastal Zone on light, well-drained soil, is relatively 



most abundant on the Serpentine Barrens, is frequent elsewhere in 



Lower Midland District, infrequent in the Upper Midland. 



Quercus lyrata Walt. Overcup Oak. 



Charles County, Zekiah Swamp (M. A. Chrysler). 



Quercus macrocarpa Michx. Bur Oak. 



Throughout the state; in flood plains and moist forests; the rarest of 



the oaks. 

 Queen Anne's County, Starr (1666). 



Quercus platanoides (Lam.) Sudw. Swamp White Oak. 



Coastal and Midland Zones, not noted in the Mountain Zone; in flood 



plains and along streams; rare. 

 Howard County, near Mt. Airy (1723). 



Quercus michauxii Nutt. Cow Oak. 



Coastal Zone; in flood plains and upland swamps, being most abundant 



in the upland clay swamps of the Eastern Shore. 

 Anne Arundel County, Galesville (M. A. Chrysler). 



