94 NATURAL HISTORY BULLETIN. 



(d) . Xerophytic species of the dry prairies. 



Pulsatilla hirsutissima (Pursh) Britton. 



Ranunculus ovalis Raf. 



R. fascicularis Muhl. 



Oxygraphis cymbalaria (Pursh) Prantl. 



Anemone caroliniana Walt. 



Delphinium carolinianum Walt. 



A PHAENOLOGICAL STUDY OF OUR SPECIES. 



The following table was compiled from various sources. 

 The time of first blooming for 1886 is from a record made 

 by Prof. Hitchcock at Ames, Iowa, and published by Prof. 

 Halsted in Bulletin Iowa Agricultural College, November, 

 1886. In using his observations we have corrected some of 

 his determinations in accordance with his catalogue of the 

 Ames Flora, a subsequent publication. For instance, 

 Clematis vioma L. is changed to C. pitcheri T. & G., 

 Ranunculus repens L. to R. scptentrionalis Poir., etc. The 

 observations for 1888, 1889, and 1890 were made by Mary 

 F. Iy. Fitzpatrick at Iowa City. The observations for the 

 other years were made by T. J. Fitzpatrick partly from 

 field work and partly by examination of herbarium material 

 checked by various notes made at the time. A general 

 uniformity in time of appearance will be noted for many 

 species which is the more remarkable when we consider 

 the different localities, soils, north or south slopes, early 

 or late seasons and the many other factors which tend to 

 hasten or retard plant growth. A few further notes may 

 be added. Actaea alba (L.) Mill, fruited Aug. 25, 1894 

 and Aug. 20, 1896. Actaea rubra (Ait.) Willd. fruited 

 June 20, 1895. Hydrastis canadensis L. fruited July 10, 

 1894 and July, 1897 which dates appear in the table and 

 are intended for fruiting dates. The species flowers in May. 

 Anemone quinquefolia L,. flowered April 17, 1880; Ranun- 

 culus multifidus Pursh flowered May 15, 1882; Thalictrum 

 purpurascens L,. flowered June 21, 1884; Delphinium caro- 

 linianum Walt, flowered June 29, 188 1, all of which dates 

 agree well with those given in the table. 



