2l8 DAVENPORT ACADEMY OF SCIENCES. 



Pyrus, L. 



223. P. Ioensis, Bailey. 



Common in open woods. Typical Pyrus coronaria, L., has 

 not yet been found within our limits. 



224. P. Americana, DC. American Mountain Ash. 



Three or four small trees in woods near Low's Run, Musca- 

 tine county. 

 Crataegus, L. Hawthorn. 



225. C. coccinea, var. flabellata, (Spach), Britton. 



Open woods ; common. Often mistaken for the type. 



226. O. coccinea, var. macracantha, Dudley. 

 Infrequent ; Wyoming Hill. 



227. C. coccinea, var. mollis, Torr. & Gray. 



Open woods ; common. Our species of this genus are all 

 found in open woods and thickets. 



228. C tomcntosa, L. 

 Infrequent. 



229. C. punctata, Jacq. 



Walnut Grove, Scott county; Muscatine. 



230. C. crus-galli, L. 



Frequent. On May 15, 1895, four species of Cratagus were 

 observed in the woods at Walnut Grove, Scott county. C. 

 coccinea, var. mollis, had small haws already formed ; var. 

 flabellata had lost all but a few petals, C crus-galli was in 

 full bloom and C. tomcntosa had begun to show white in 

 the bud. C. punctata blooms with C. tomentosa. This 

 sequence of inflorescence appears constant, the intervals 

 between succeeding species being about a week. 

 Amelanchier, Medic. 



231. A Canadensis, Torr. & Gray. Service-berry. 

 Woodlands of Muscatine county ; frequent 



SAXIFRAGACE^. 

 Saxifraga, L. 



232. S. Pennsylvanica , L. Saxifrage. 

 Low wet places ; common. 



Mitella, Tourn. 



233. M. diphylla, L. liishop's Cap. 

 Rich wooded hillsides ; infrequent. 



