INDEX TO AMERICAN BOTANICAL LITERATURE 
1907-1921 
The aim of this Index is to include all current botanical literature written by 
Americans, published in raglan or based upon American material ; the word Amer- 
ica being used in the broadest se 
eviews, and papers that solits exclusively to forestry, agriculture, oC 
mansicred products of vegetable origin, or laboratory methods are not included, an 
© attempt is made to index the literature of bacteriology. An occasional autos is 
sata in favor of some paper appearing in an American 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 omissions, their kindness will be appreciated. 
This Index is reprinted monthly on cards, and furnished in this form to sub- 
scribers at the rate of three cents for each card. Selection of cards is 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. Rusts of conifers in Pennsylvania. Pennsylvania 
State Coll. Bull. 160: 3-30. f. z-ro. D 1919. 
Adams, J. F. Sexual fusions and development of the sexual organs in 
the peridermiums. Pennsylvania State Coll. Bull. 160: 31-76. 
pl. 1-5 +f. 1-8 D 1919. 
Alexander, W.P. What spring means to the lover of flowers. Hobbies 
2?: 3-9. Je 1921. [Illust.] 
Discusses wild flowers near Buffalo, New York. 
Allen, R. F. Resistance to stem rust in Kanred wheat. Science II. 
53: 575, 576. 24 Je 1921. 
Ashe, W. W. Suggestions for a national arboretum. Jour. For. 19: 
562-564. My 1921. 
In a footnote are made many new combinations of Tsutsusi (Azalea). 
Ball, C. R. Undescribed willows of the section Cordatae. Bot. Gaz. 
7%: 426-437. f. 1. 17 Je 1921. 
Includes Salix monochroma sp. nov. from Wyoming. 
Barrus, M. F. Physiological diseases of potatoes. Rep. Quebec 
Soc. Protect. Plants 9: 45-53. 1917 [IIlust.] 
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