Plants 6 dm. or higher ; sterile leaves broadly lanceo- 
late, narrowed towards the base ; pinnae linear, acumin- 
ate, 12 cm. more or less 1., 1.5 cm. or less wide, deeply 
pinnatifid ; lobes oblong, rounded ; fertile leaves much 
shorter, pinnate. 
Along river banks. Summer. 
Gunpowder River, Md., Wafers; Pkimmer's Island, Steele; 
Fairfax Co., Va., Afaxon, 
23. ONOCLEA L. 1753. 
Robust plants with creeping rootstocks. Leaves scatter- 
ed. Fertile leaves 2-pinnate, the contracted pod-like divi- 
sions enclosing the sporangia. 
1, O. sensibilis L. 
Filix OsmtiJida facie AIa7'ia7ta . . Pluk. i yco, 
Mant. 80. 404. f. 2. 
Osfnunda f ro7tdibus pinnatis : foliis superio7'i' 
bus basi cojtitatis , . Gron. 1743, Fl. Virg. 
2 : 196. 
Onoclea sensibilis L. Sp. PI. 1062. Eato7t^ 
Ferns N. Am. 2: 195. t.72 ; in Gray, Man. 
690. Underw. in 111. Fl. i : 9 ; Nat. Ferns 
120; in Britt. Man. 19. Cluie^ Ferns 253^ 
Watei's^ Ferns 265. 
Sensitive Fern. 
54 
