» f *^' '\ • 



Volume LXVII Number 3 



THE 



Botanical Gazette 



Editor: JOHN M. COUU'ER 



MARCH 1919 



Relation of Minimum Moisture Content of Subsoil of Prairies to Hygro- 

 scopic Coefl5cient - - F. J. Alway, G. R. McDole, and R. S. Trumbull 185 



Notes on North American Trees. IV - - - - C. S. Sargent 208 



Possible Correlations Concerning Position of Seeds in the Pod 



Byron D. Halsted 243 

 Embryo and Seedling of Dioon spinulosum - Sister Helen Angela Dorety 251 



(With Plates X, XI) 



Development of Strcpharia epimyces - - - - W. B. McDougall 258 



(With ten figures) 



r Briefer Articles 



Hybrid Perennial Sunflowers - - - - T. D. A. Cockerell 264 



Relationships within the Rhodosporeae - - - - Geo. F. Atkinson 266 



Current Literature 



Minor Notices --------___ 268 



Notes for Students - - - - - - - _ _ -269 



The University of Chicago Press 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



THE MARUZEN-KABUSHIiCMCAISHA. Tokyo. Osaka. Kyoto. Fukuoka. Sendai 



THE MISSION BOOK COMPANY. Shanghai 



