INDEX TO AMERICAN BOTANICAL LITERATURE 
1915-1917 
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 Amer- 
ica being used in the broadest sense. 
Re views, and ers that relate exclusively to forestry, agriculture, horticulture, 
tached re as of vegetable origin, or laboratory methods are not included, an 
no attempt is made to index the literature of bacteriology. An occasional exception is 
made 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 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 one cent for each card. Selections of cards are not permitted; each 
pace ate must take all cards published during the term of his subscription, Corre- 
pondence relating to the card issue should be addressed to the Treasurer of the Torrey 
Dorudical Club, 
Ashe, W. W. Notes on trees and shrubs. Bull. Charleston Mus. 13: 
25-28. Ap 1917. 
Andrews, A.L. Bryological notes—III. Further mosses new to Iceland. 
Torreya 17: 60-62. 10 My 1917. 
Blizzard, A. W. The development of some species of Agarics. Am. 
Jour. Bot. 4: 221-240. pl. 6-11. Ap 1917. 
Burnham, S.H. The ferns of the Lake George flora, N. Y. Am. Fern 
Jour. 7: 54-63. My 1917. 
Christensen, C. New Polypodiums from tropical America. Am. Fern 
Jour. 7: 33-35. My 1917. 
Polypodium steirolepis and P. tobagense, spp. nov. 
Collins, F. S. The Sargasso Sea. Rhodora 19: 77-84. 1 My 1917. 
Cowgill, H. B. Report of the plant breeder. Rep. Board Comm. Agr. 
Porto Rico 5: 16-34. I917. 
Davis, B. M. Some inter- and back-crosses of F; Oenothera hybrids. 
Genetics 2: 155-185. f. 1-6. . Mr 1917. 
Dunn, L. C. Nucleus and cytoplasm in heredity. Am. Nat. 51: 
286-300. My 1917. 
Fernald, M. L. The identity of Circaea canadensis and C. intermedia. 
Rhodora 19: 85-88. 1 My 1917. © 
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