1152 Bibliography 



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 Pennell, Francis W. Plants of the southern United States — V. Bull. Torrey 



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 Pennell, Francis W. Penstemon calycosus Small. Addisonia 4 : 31-32. 1 col. 



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 Pennell, Francis W. Agalinis and allies in North America — I. Proc. Acad. 



Nat. Sciences of Philadelphia 80: 339-449. 1928. 

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Nat. Sciences of Philadelphia 81: 111-249. 1929. 

 Pennell, Francis W. "Polygala verticillata" in eastern North America. 



Bartonia 13: 7-17. 2 pi. 3 fig-. 1932. 

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 Pepoon, Herman S. Peculiar plant distributions. Trans. Illinois Acad. Sci. 



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 Petrak, F. Die nordamerikanischen arten der gattung Cirsium. Beihefte 



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 Pfeiffer, Norma E. The prothallia of Ophioglossum vulgatum. Bot. Gaz. 



61 : 518-522. 4 fig. 1916. 

 Pfeiffer, Norma E. Monograph of the Isoetaceae. Ann. Missouri Bot. Gard. 



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 Phinney, A. J. Geology of Delaware County, Indiana. Ann. Rept. Indiana 



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 Pickett, F. L. Is Pellaea glabella Mett. a distinct species? Amer. Fern 



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 Pilger, Robert. Plantaginaceae. Das Pflanzenreich, IV: 269. 1937. 

 Pipal, F. J. Wild garlic and its eradication. Purdue Univ. Agric. Exper. 



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 Pipal, F. J. A list of plant diseases of economic importance in Indiana 



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