Vol. 11 
JUNE, 1915 
No. 6 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
fi m 
CONTENTS 
The exchange of ions between the roots of Lupinus albus and culture solu- 
tions containing one nutrient salt. 
Rodney H. True and Harley Harris Bartlett 255 
Notes on the forms of Castela Galapageia. . Alban Stewart 279 
The development of Pyronema confluens var. inigneum. 
William H. Brown 289 
New or noteworthy grasses A. S. Hitchcock 299 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa« 
Entered aa second-class matter February ai, 1914, at the post office at Lancastei, Pennsylvania, 
under the act of March 3, 1879. 
