eee ee ee ee ee ee 
ONOCLEA, sensitive fern 
Onoclea sensibilis L., sensitive fern [S: incl. f. obtusilobata (Schk.) 
Gilbert] (Beitel et al., 1981), p. 27 
POLYSTICHUM, holly fern 
Polystichum acrostichoides nat Schott, Christmas fern [S: 
isum Gray) Gilbert] (Wagner et al., 
1970), p. 41 
WOODSIA, cliff fern 
Woodsia obtusa (Sprengel) Torrey, blunt-lobed cliff fern, p. 36 
MARSILEACEAE, pepperwort family 
MARSILEA, water-clover, pepperwort 
¢Marsilea quadrifolia L., European water-clover, p. 17 
M. vestita Hook. & Grev. [S: M. mucronata A. Braun], see 
excluded taxa 
PILULARIA, pillwort 
*Pilularia americana A. Braun, pillwort (Key, 1982) 
OPHIOGLOSSACEAE, adder’s tongue family 
BOTRYCHIUM, grape fern 
Botrychium biternatum (Savigny) Underw., sparse-lobed grape fern 
S: B. 
issectum var. daa (Underw.) Farw.] 
(Wagner, 1961), p. 1 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
