MICHIGAN ACADEMY OF SCIENCE. 331 



Polyembryony in Quercus alba is of especial interest as it is the 

 first case to be discovered in tlie first thirteen Alliances of the 

 Archichlamydeae. 



LITERATURE CITED. 



^ Ernst, A. Beitrage zur Kenntniss der Entwickelung des Embryo- 

 sackes und Embryo (Polyembryonie) von Tiilipa Gesneriana. Flora. 

 88:37-77. 1901. 



"Coulter, J. M., and Chamberlain, C. J. Morphology of the Angio- 

 sperms. 1903. 



^Engler-Gilg. Syllabus der Pflanzenfamilien. 7 Auflage. 1912. 



