THELYPTERIDACEAE, marsh fern family 
[S: POLYPODIACEAE] 
PHEGOPTERIS (see THELYPTERIS) 
THELYPTERIS, marsh fern 
Thelypteris hexagonoptera (Michaux) Weath., broad beech fern 
[M: Phegopteris hexagonoptera (Michaux) Fée] 
(Lellinger, 1985), p. 38 
T. palustris Schott, marsh fern, p. 38 
var. pubescens (Lawson) Fern. 
CLASS EQUISETOPSIDA, horsetails 
EQUISETACEAE, horsetail family 
EQUISETUM, horsetail, scouring rush 
Equisetum arvense L., field horsetail, common horsetail [S: incl. f. 
diffusum (A. A. Eaton) Clute, £. ramulosum (Rupr.) 
E. laevigatum A. Braun, smooth scouring rush [S: E. kansanum 
Schaffner] (Hauke, 1963), p. 12 
*E. pratense Ehrh., meadow horsetail (Jacobs, 1989) 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
