PROCEEDINGS 



OF THE 



AMERICAN PHILOSOPHICAL SOCIETY 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. XLVI October-December, 1907. No. 187. 



TAXONOMIC CHARTS OF THE MONOCOTYLEDONS 

 AND THE DICOTYLEDONS. 



By JOHN W. HARSHBERGER, Ph.D. 



(Read April 19, 1907.) 



At various times botanists have constructed phylogenetic dia- 

 grams to show the evolutionary relationship of the various families 

 of plants, but in all of these family trees the attempt has been made 

 to represent the actual evolutionary history of each plant group. 

 Beyond representing the general lines of evolution of the vegetable 

 kingdom, these diagrams, it seems to the writer, do not go. Haeckel 

 in his " Phylogenie der Protisten und Pflanzen " gives elaborate 

 tables to represent the phylogeny of different plant groups, Camp- 

 bell in his lectures on the "Evolution of Plants" (1899) gives at 

 the close of each important section of his book family trees of the 

 algae, fungi, mosses, ferns and flowering plants. Bessey^ in 1897 

 discussed before the Botanical Society of America the phylogeny 

 and taxonomy of the angiosperms, while Engler in The Botanical 

 Gazette in May, 1898 (pp. 338-352), discusses the taxonomic divi- 

 sion of the spermatophytes, as an abridged treatment of the same 

 subject in Parts IL, III. and IV. of the supplement to his " Die 

 natiirlichen Pflanzenfamilien." Bonnier and Sablon give useful 



^ Bessey, Charles E., " The Phylogeny and Taxonomy of Angiosperms," 

 Botanical Gazette, XXIV (1897). 



PROC. AMER. PHIL. SOC. , XLVI. 1S7 V, PRINTED JANUARY 20, I908. 



