AMERICAN 
JOURNAL OF BOTANY 
Devoted to All Branches of Botanical Science 
Established 1914 
EDITED BY A COMMITTEE OF THE 
BOTANICAL SOCIETY OF AMERICA 
EDITORIAL COMMITTEE 
F. C. Newcombe, Editor-in-Chief, 
, University of Michigan 
C. Stuart Gager, Business Manager A. S. Hitchcock, 
Brooklyn Botanic Garden ' Bureau of Plant Industry 
Irving W. Bailey, L.R.Jones,, 
Bussey Institutioit University of Wisconsin 
H. H. Bartlett Edgar W. Olive, 
University of Michigan Brooklyn Botanic Garden 
The Journal is published monthly, except during August and September. 
Subscription price, ^4.00 a year. Single copies 50 cents, plus postage. Postage will 
be charged to all foreign countries, except Mexico, Cuba, Porto Rico, Panama 
Canal Zone, Republic of Panama, Hawaii, Philippine Islands, Guam, Samoan 
Islands, and Shanghai. Postage to Canada 20 cents a volume on annual subscrip- 
tions ; to all other countries in the Postal Union, 40 cents a volume On annual sub- 
scriptions. 
The pages of the Journal are open to members of the Botanical Society of 
America, or candidates approved for membership. 
Manuscript offered for publication should be typewritten, and should in all 
cases be submitted to the Editor-in-Chief . 
Papers are limited to 24 pages in length, exclusive of plates, except that ad- 
ditional pages may be arranged for at cost rates to authors. 
Proofs should be corrected immediately on receipt, and returned to American 
Journalof l^otany, Brooklyn Botanic Garden, Brooklyn, N.> Y. 
Illustrations, other than zinc etchings, and tabular matter should, in general, 
be restricted to approximately ten per cent, of the number of pages of text. Authors 
may be charged at cost rates for illustrations and tabular matter in excess of that 
amount. 
Separates should be ordered when proof is returned. Fifty copies without cover 
will be supplied free; cover and additional copies at cost. 
Remittances should be made payable to Americah Journal of Botany. Ten 
cents must be added to all checks not drawn on New York City banks. 
Cl£ums for missing numbers should be made within 30 days following their 
date of maiUng. The publishers will supply missing nuipbers free only When they 
have been lost in the mails. 
Gorrespondence concerning editorial matters should be addressed to Prof. F. 
C. Newcombe, 9 Geddes Heights, Ann Arbor, Mich. 
Business correspondence, including notice of change of address, and directions 
concerning reprints, should be addressed to American Journal of Botany, Brook- 
lyn Botanic Garden, Brooklyn, N. Y,, or 41 North Queen Street, Lancaster, Pa. 
