390 THE PLANT LIFE OF MARYLAND 



Equisetum hyemale L. Scouring-rush. 



Throughout the state; in moist forests, thickets and open situations; 



common. 

 Allegany County, Cumberland (1931). 



LYCOPODIACEAE. 



Lycopodium lucidulum Michx. Shining Club-moss. 



Rare in the Coastal Zone; frequent in the Midland and Mountain Zones; 



in moist forests, preferring rocky slopes. 

 Baltimore County, Catonsville (1357). 



Lycopodium inundatum L. Bog Club-moss. 



Coastal Zone; in bogs, sandy swamps and open situations with moist 



sandy soil; infrequent. 

 Worcester County, Herring Creek (635). 



Lycopodium obscurum L. Ground Pine. 



Throughout the state; in dry forests; infrequent. 

 Talbot County, Easton (1360). 



Lycopodium clavatum L. Running Pine. 



Midland and Mountain Zones; on exposed rocks and in dry forests; rare. 

 Baltimore County, Parkton (1369); Garrett County, Thayerville (2053). 



Lycopodium complanatum L. Christmas-green; Crow-foot. 



Throughout the state; in dry forests; common. 

 Talbot County, Easton (328). 



Lycopodium tristachyum Pursh. 



Washington County, Tonoloway Ridge, in dry sandy woods (762). 

 Montgomery County, Rockville (C. E. Waters). 



SELAGINELLACEAE. 



Selaginella rupestris (L.) Spring. Rock Selaginella. 



Midland and Mountain Zones; on open rock outcrops; infrequent. 

 Baltimore County, Loch Raven (451). 



Selaginella apus (L.) Spring. Creeping Selaginella. 



Throughout the state; on the ground among grasses in moist open situa- 

 tions; common. 



ISOETACEAE. 



Isoetes saccharata Engelm. Quillwort. 



Coastal Zone; on mud between tiues in estuaries and streams just above 



saline influence; rare. 

 Harford County, Gunpowder River (467). 



Isoetes engelmannli var. valida Engelm. 



Midland and Mountain Zone; in open moist situations among grasses 



and sedges; rare. 

 Frederick County, Myersville (1797); Garrett County, Crellin (1983). 



