MICHIGAN ACADEMY OF SCIENCE. 346 



derive the Oryzeae from some of the more highly deveh)ped Bambiiseae 

 that have the spikelets reduced to one floret. 



To summarize briefly: The Grass flower is of the Lily type, mostly 

 however, with but one whorl of stamens, and with one petal and one 

 sepal missing. The spikelet is homologous to the two-ranked spikes of 

 flowers found in some Liliales, e. g., some Bromeliaceae, the lemmas being 

 homologous to the subtending bracts of such a spike. This being so, 

 those grasses whose spikelets and flowers most nearly resemble such 

 liliaceous spikes and flowers must be considered as representing the most 

 jarimitive grasses. Such we find among the Bambuseae. From this tribe 

 arose the Festuceae and Oryzeae. The former gave rise to the Hordeae 

 and Aveneae, the latter leading to the Agrostideae. The Phalarideae, 

 Paniceae and Andropogoneae probably arose from a common root from 

 the Festuceae, the Andropogoneae giving rise to the Maydeae. 



BIBLIOGRAPHY.* 



Bentham, G., and Hooker, J. D. Genera Plantarum ad exemplaria 

 imprimis in herbariis Kewensibus servata definita. Vol. 3, part 2, pp. 

 1074-1215, 1880 (.?). 



Hackel, E. Gramineae, in Engler, A., und Prantl, K. Die natuerlichen 

 Pflanzenfamilien. II Teil, 2. Abteilung, pp. 1-97, 1887. 



Hitchcock, A. S. Gramineae in Robinson, B. L., and Fernald, M. L. 

 Gray's New Manual of Botany (seventh edition, illustrated), pp. 86-171, 

 1908. 



Nash, G. V. Gramineae in Britton, N. L. and Brown, A. An Illus- 

 trated Flora of the Northern United States, Canada and the British 

 Possessions. Second Edition, Vol. I, pp. 107-295, 1913. 



Lamb, William H. The Phylogeny of Grasses. The Plant World, 

 Vol. 15, pp. 264-269. Nov., 1912. 



Walker, Elda Rema. On the Structure of the Pistils of Some Grasses. 

 University Studies, Vol. 6. No. 3, pp. 203-218, July, 1906. 



Schuster, J. Ueber die Morphologic der Grasblilte. Flora. Bd. 100, 

 l^p. 213-266, 1910. 



*Only such titles are listed here as were mentioned in the text. 



