MARYLAND WEATHER SERVICE 423 



Populus grandidentata Michx. Large-toothed Poplar. 



Rare in the Eastern Shore District, infrequent throughout the remainder 

 of the state. 



Populus tremuloides Michx. American Poplar. 



Mountain Zone; infrequent about the margins of forests and swamps. 



Populus dilatata Ait. Lornbardy Poplar. 



Throughout the state in cultivated grounds. Introduced from Europe. 



Salix nigra Marsh. Black "Willow. 



Throughout the state; in flood plains and along streams; common. 

 Dorchester County, Little Blackwater River (1602). 



Salix wardii Bebb. 



Midland Zone; frequent at several localities along the Potomac River. 

 Allegany County, Cumberland (1014). 



Salix alba var. vitellina (L.) Koch. White Willow. 



Throughout the state; in flood plains and along streams; common. 



Salix babylonica L. Weeping Willow. 



Throughout the state; in cultivated grounds. Introduced from Europe. 



Salix humilis Marsh. Prairie Willow. 



Coastal and Midland Zones; in dry forests and open situations; frequent. 



Salix tristis Ait. Sage Willow. 



Throughout the state; in dry open situations and on thin rocky soil; 



frequent. 

 Cecil County, near Elkton (376). 



Salix discolor Muhl. Pussy Willow. 



Coastal and Midland Zones; along streams; infrequent. 



Salix sericea Marsh. Silky Willow. 



Midland and Mountain Zones; along streams; frequent. 

 Allegany County, Braddock Run (905). 



BETULACEAE. 



Carpinus caroliniana Walt. Hornbeam, Blue Beech. 



Throughout the state, being most common in flood plains and along 

 streams in the Midland Zone; also frequent in moist forests and 

 infrequent in swamps throughout the Midland and Mountain Zones; 

 infrequent in the southern, and frequent in the northern Eastern 

 Shore. 



Ostrya virginiana (Mill.) Willd. Hop-hornbeam, Ironwood. 



Midland and Mountain Zones; in moist forests and on rocky slopes; 

 infrequent. 



