Michigan Academy of Science, 



Seventeenth Annual Report. 

 Plate XV. 



Aster ales 



ales 

 arniales 



lemoni- 



nales 



iniilales 



-cales 



yOTohyl- 

 1 ales- 

 dales 



'-eraniales 



"Liliales 



Alisrna tales 



Hanales 



i'alvales 



Diagrammatic; scheme of evolution witliin the Aiitliophyta. The area of each 

 order is proportional to the knciwn nuniber of species in that order. From C. E. 

 Bessey, Essentials of College Botanj^, 1914. 



