INDEX TO AMERICAN BOTANICAL LITERATURE 
1917-1921 
The aim of this Index is to include all current botanical literature written by 
Americans, published in Sh or based upon American material ; the word Amer- 
ica being used in the broadest sense. 
Reviews, and papers that amie exclusively to forestry, agriculture, horticulture, 
manufactured products o: vegetable origin, or laboratory apse are not included, anc 
no attempt is made to index the literature of bacteriolo, sc occasional exception is 
made in favor of some paper appearing in an America se tana which is devoted 
wholly to botany. Reprints are not aio tis 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 two cents for each card, Selections of cards are is permitted ; each 
subscriber must take all cards published during the term of his subscription, Corre. 
spondence relating to the card issue should be addressed to the hee of the Torrey 
Botanical Club. 
Peltier,G.L. Influence of temperature and humidity on the growth of 
Pseudomonas Citri and its host plants and on infection and develop- 
ment of the disease. Jour. Agr. Research 20: 447-506. 15 D 
1920. 
Popenoe, W. The Colombian berry or giant blackberry of Colombia. 
Jour. Hered. 11: 195-202. 20 Ja 1921. [lllust.] 
Rabiis roseus (? 
‘Popenoe, W. The tree dahlia ok Guatemala. Jour. Hered. 11: 
265-268. f. 20-22. °§ F 19321. 
Dahlia maxoni Safford. 
Praeger, W. E. A collection of Sphagnum from the Douglas Lake 
region, Cheboygan County, Michigan. Ann. Rep. Michigan 
Acad. Sei. ar: 237, 238. Ji 10920. 
Reed, H. S. Volney Morgan Spalding. Plant World 22: 14-18. 
Ja 1919. 
With portrait. 
Reyes, L. J. Fiber studies of Philippine dipterocarps. Jour. For. 
19: 97-104. F 1921. 
Roberts, J. W. Clitocybe sudorifica as a poisonous mushroom. Myco- 
logia 13: 42-44. 3 F 1921. 
183 
