PLATE XXIII. 



Page. 



Fig. 1. Cabomba(?) gracilis Newb 91 



2. Cabomba inermis (Newb.) Hollick_._ --. 92 



3. Onoclea sensibilis f ossilis Newb — 8 



4. Onoclea sensibilis L. (introduced for comparison) 9 



5. 6. Onoclea sensibilis obtusilobatus Torr. (introduced for comparison) 9 



200 



