1. OPHIOQLOSSUM Trag. 1551. 
Lingua serpentina Latiitis, Grcecis o<ploy\(x)(T(Tov & 
Germanis Naterzuenglin^ a forma sua . . . Trains, 
1552. Hist. 333. fig. 
Rootstock erect with numerous fleshy roots. Sterile 
lenf-segment entire, lanceoLite to ovate or rotund. Spore 
cases connate forming a two-ranked spike. 
t Sterile segment obtuse. 
1. O. vulgatum L. Pi.. I. 
Ophioglossum radice repeitte. Grcn. i743- Fl. 
Virg. ip5. 
Ophioglossu77i vulgatuni L . 1753. Sp. PI. 1062. 
Raton 1880. Ferns N. Am. 3 1261 . t. 81 . f . i- 
4;i8S9. in Gray Man. 695. Unde7^w. 1896 in 
III. Fl. I : 2;i9CO Xat. Ferns 66 ; 1901. in Br. 
Man. 2. Clute^ 1901. Ferns 45. t. i. Waters., 
1903. Ferns 25. 31.1. 
Adder's Tonguk. 
Plants 1-3 dm. high; sterile leaf-segment ovate-ellip- 
tic, 3-10 cm. long, inserted below the middle of the peti- 
ole ; spike 2-4 cm. long. 
In meadows and woods, rare. 
Terra Cotta, Bennings, Garrett Park, Holm\ Rock Creek, 
Bladensburg, Back Lick Run, Ward\ Md. Agric. Coll., Vasey \ 
Upper Marlborough, Maxon\ Woodside, Pollard \ Woodburn 
Manor, Va., Rey?iold^. 
Used by the ancients in the healing of Avounds ; hence the 
Swedish word I^oeketnnga 'healing-tongue.' 
