INDEX TO AMERICAN BOTANICAL LITERATURE 
1920-1922 
The aim of this Index is to include all current botanical literature written by 
Americans, published in America, or based upon American material; the word 
merica being used in the broadest sense. 
Reviews, and papers that relate exclusively to foresty, agriculture, horti- 
culture, manufactured anges of vegetanic righ, * or laboratory methods 
f bacteriology. 
An occasional pedis is made i in favor of some paper appearing in an Ameri- 
can periodical which is devoted wholly to botany. Reprints are not mentioned 
unless they differ from the original in some important particular. If users 
of the Index will call the attention of the editor to errors or omissions, their 
kindness will be appreciated. 
This Index is reprinted monthly on cards, and furnished in this form to 
subscribers at the rate of three cents for each card. Selections of cards are 
not permitted; each subscriber must take all cards published during the term 
of his subscription. Correspondence relating to the card issue should be 
addressed to the Treasurer of the Torrey Botanical Club. 
Adams, J. F. Observations on frost protection and drouth 
spot of apple. Phytopathology 12: 184-187. f. 1. 29 Je 
1922. 
Allen, W. E. Observations on surface distribution of marine 
diatoms between San Diego and Seattle. Ecology 3: 140- 
1456 f:1.5< 26, An 1922. 
Ames, O. Descriptions of new orchids from tropical America 
with nomenclatorial changes. Proc. Biol. Soc. Washington 
35: 81-88. 26 My 1922. 
Includes 8 new species and 20 new combinations. 
Anderson, F: The development of the flower and embryogeny 
of Martynia louisiana. Bull. Torrey Club 49: 141-157 
pl. 7, 8. 15 Je 1922. 
Andrews, F. M. Saprolegnia. Proc. Indiana Acad. Sci. 1921: 
75-77. 5-1; 2: 1682. 
Andrews, F. M. Trillium nivale. Proc. Indiana Acad. Sci. 
1921: 81-86. pl. 1 + f.1. 1922. 
Andrews, F. M. Vaucheria. Proc. Indiana Acad. Sci. 1921: 79’ 
BG. fh, 25: $oag. 
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