IOWA ACADEMY OF SCIENCES. 
203 
fragmentary data is about 25 inches, and is usually so 
distributed as to be sufficient for agricultural operations, 
though in some seasons vegetation suffers from hot, south- 
west winds. 
The synonomy adopted in the following catalogue is that 
of the Illustrated Flora , with such emendations as more 
recent publications make necessary. The names used in 
Gray’s Manual , sixth edition, and the Illustrated Flora 
when different from those adopted in this list, are printed 
in parentheses. 
The author takes pleasure in acknowledging valuable 
assistance in studying our native flora from numerous 
specialists in this and other states. Among those in our 
own state, whose aid has been freely given, are Prof. Thos. 
H. Macbride and Prof. B. Shimek of the Iowa State Uni- 
versity; Prof. L. H. Pammel of the Iowa State College at 
Ames, and Prof. T. J. Fitzpatrick of Estherville, all of whom 
have published valuable papers treating different phases of 
the Iowa flora. 
PTERIDOPHYTA. 
POLYPODIACE^E . 
Onoclea L. 
1. 0. sensibilis L. Sensitive Fern. Rare in woods, 
Estherville; also introduced in an artificial grove 
in Armstrong Grove township. 
2. 0. struthiopteris (L.) Hoff. Ostrich Fern. Infre- 
quent, Estherville and Armstrong Grove town- 
ships. 
Cystopteris Bernh. 
3. C. fragilis (L.) Bernh. Rare in woods throughout. 
Asplenium L. 
4. A. fllix-foemina (L.) Bernh. Lady Fern. Woods, 
and occasionally in artificial groves; our most 
common species. 
Adiantum L. 
5. A. pedatum L. Maiden-hair Fern. Woods along 
West Fork of the Des Moines. 
