Bibliography 1153 



Pipal, F. J. Red sorrel and its control. Purdue University Agric. Exp. 



Sta. Bull. 197: 1-28. 1916. 

 Piper, Charles V. North American species of Festuca. Contr. U. S. Na- 

 tion. Herb. 10 : 1-48. 15 pi. 1906. 

 Poe, lone. A revision of the Plantago patagonica group of the United 



States and Canada. Bull. Torrey Bot. Club 55: 406-420. 1928. 

 Potzger, J. E. Some observations on Pinus virginiana Mill, in Monroe 



County, Indiana: an ecological study. Proc. Indiana Acad. Sci. 41: 



153-174. 1932. 

 Potzger, J. E. Plants previously unreported for Monroe County, Indiana. 



Proc. Indiana Acad. Sci. 41: 175-176. 1932. 

 Potzger, J. E. Notes on Indiana grasses, 1932. Proc. Indiana Acad. Sci. 



42: 93-95. 1933. 

 Potzger, J. E. Notes on Indiana grasses, 1933. Proc. Indiana Acad. Sci. 



43: 50-55. 1934. 

 Potzger, J. E. A notable case of bog formation. Amer. Midland Nat. 15: 



567-580. 1934. 

 Potzger, J. E. Topography and forest types in a central Indiana region. 



Amer. Midland Nat. 16 : 212-229. 1935. 

 Potzger, J. E. Notes on Indiana grasses, 1934. Proc. Indiana Acad. Sci. 



44: 82-86. 1935. 

 Potzger, J E. Post pleistocene fossil records in peat of the upper Blue 



River Valley, Henry County, Indiana. Proc. Indiana Acad. Sci. 45: 



64-68. 1936. 

 Potzger, J. E. Notes on Indiana grasses, 1935. Proc. Indiana Acad. Sci. 



45: 103-107. 1936. 

 Potzger, J. E. Notes on Indiana grasses, 1936. Proc. Indiana Acad. Sci. 



46: 79-80. 1937. 

 Potzger, J. E. Notes on Indiana grasses, 1937. Proc. Indiana Acad. Sci. 



47: 75. 1938. 



Prentice, Burr N. Some elementary notes on stem analysis of white oak. 

 Proc. Indiana Acad. Sci. 1915: 153-162. 1916. 



Price, Gladys, and Winona H. Welch. Enumeration of the vascular flora of 

 a limestone area of the Bloomington quadrangle, Monroe County, Indi- 

 ana. Proc. Indiana Acad. Sci. 39: 127-131. 1930. 



Rafinesque, Constantine S. (Describes Oenothera pilosella from Indiana, 

 near Evansville, Vanderburgh County. Annals of Nature 15. 1820.) 



Ragan, W. H. Cultivating the black walnut. Trans. Indiana Hort. Soc. 

 1881: 171-173. 1882; also in Indiana State Board Agric. 23: 239-211. 



1882 



Ragan, W. H. The hemlock (Abies canadensis) in Indiana. Trans. Indi- 

 ana Hort. Soc. 1892: 51-53. 1893. 



Rawls, Elizabeth S. Common trees of the vicinity of Indianapolis; key, 

 identification, and planting notes. Published by Shortridge High School 

 Biologv Dept. (Indianapolis, Indiana) 1930. 



Rechinger, K. H., Jr. The North American species of Rumex. Field Mus. 

 Nat. Hist. Publ. Bot. Ser. 17: 1-151. 1937. 



