GYMNOSPERMAE. 



PINACEAE. 



Pinus strobus L. White Pine. 



Absent from the Coastal Zone; occurs throughout the Mid' ami and 



Mountain Zones. Reaches its best development in the Mountain Zone, 



is frequent in the Upper Midland District and infrequent in the Lower 



Midland District. 



Pinus virginiana Mill. Scrub Pine, Short-leaf Pine. 



Occurs throughout the Coastal and Midland Zones, is infrequent in the 

 Mountain Zone. On the Talbot formation on the Eastern Shore it is 

 uncommon near tide water; on the Wicomico formation it is abundant 

 in company with Pinus taeda or in pure stands due to artificial re- 

 forestation. In the upper portion of the Eastern Shore it is a minor 

 constituent of the deciduous forest. In the sandy portion of the 

 Western Shore District of the Coastal Zone it is an important constitu- 

 ent in the coniferous forest chiefly made up of Pinus rigida. In other 

 portions of the Western Shore District, and on the cretaceous gravels, 

 it attains its greatest development in Maryland. To the north and 

 west of the Fall Line belt of gravel soils it is sporadically common in 

 pure stands. It is found naturally on rocky precipices or on steep 

 slopes with thin soil, or on gravel hills. In the Mountain Zone it 

 occurs occasionally in mixed stands to the east of Big Savage and 

 Great Backbone mountains, but has not been seen on the plateau to 

 the west of them. 



Pinus echinata Mill. Yellow Pine. 



Apparently occurs infrequently throughout the state. Reported by Mell 

 (in MS.) for Worcester County, and by Curran for Cecil and Calvert 

 counties. Also known from the rocky ledges of Wills Narrows, near 

 Cumberland and from Sharptown, Wicomico County. 



Allegany County, Wills Narrows (1936). 



Pinus pungens Michx. f. Table Mountain Pine. 



Upper Midland District and Mountain Zone. Is nowhere abundant 

 usually occurring in company with Pinus virginiana or Pinus rigida 

 on rocky precipices or steep mountain slopes with thin soil. 

 Washington County, Sideling Hill (797). 



Pinus taeda L. Loblolly Pine, Fox-tail Pine, Bull Pine. 



Confined to the Coastal Zone, but occurring for about 20 miles above 



the Fall Line along the Potomac River, and absent from Cecil and 



upper Kent counties (See map, Plate IV). Common in the southern 



Eastern Shore, particularly on the Talbot formation and on the light 



