RANUNCULACEAE OF IOWA. 93 



to Iowa Ranunculaceae. Many works and journals contain 

 notes on Iowa species the most important and accessible 

 being quoted in the text. 



AN ECOLOGICAL STUDY OF OUR SPECIES. 



The following lists divide our species with reference to 

 their environment rather loosely into four classes. 



(a). Aquatic or hydrophytic plants. 



Batrachium trichophyllum (Chaix) Bossch. 



B. divaricatum (Schrank) Wimtn. 

 Ranunculus delphinifolius Torr. 



(d) . Semi-hydrophytic plants. 



Ranunculus sceleratus L. 

 Caltha palustris L. 

 Anemone canadensis L. 



(c) . Mesophytic species of woodlands and meadows. 



Clematis virginiana L. 



C. simsii Sweet. 

 Anemone cylindrica Gray. 

 A. virginiana L. 



A. quinquefolia L. 



Hepatica acuta (Pursh) Britton. 



Delphinium iricorne Mx. 



Actaea rubra (Ait.) Willd. 



A. alba (L.) Mill. 



Syndesmon thalictroides (L.) Hoffmg-. 



Thalictrum dioicmn L. 



T. purpurascens L. 



Ranunculus repens L. 



R. septentrionalis Poir. 



R. recurvatus Poir. 



R. pennsylvanicus L. f. 



R. hispidus Hook. 



R. abortivus L. 



Myosurus minimus L. 



IsoPyrum biternatum (Raf.) T. & G. 



Aquilegia canadensis L. 



Hydrastis canadensis L. 



