INDEX TO AMERICAN BOTANICAL LITERATURE 
1916-1922 
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 
America being used in the broadest sense. 
Reviews, and papers that relate exclusively to foresty, agriculture, horti- 
estes manufactured products of vegetable Orig or laboratory methods 
f bacteriology. 
An occasional ereption is made i in favor of some paper appearing in an Ameri- 
can periodical w wholly to botany. Reprints are not mentioned 
unless they differ from the original in some important particular. If users 
of the Index will call =a ea: of the editor to errors or omissions, their 
kindness will be appr 
This Index is pees moran 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. 
Rhoads, A. S. The pathology of Lupinus arboreus, with special 
reference to the decay caused by two wound-parasites, 
Collybia velutipes and Pleurotus ostreatus. Phytopathology 
11: 389-404. pl. 18-zo. 16 F 1922. 
Rigg, G. B. Identity of cetain yellow pigments in plants and 
animals. Science II, 55: 101, 102. 27 Ja 1922. 
Robbins, W. W. Mosaic diseases of sugar beets. Phytopathol- 
ogy. 11: 349-365. f. 7-8. 27 Ja 1922. 
Robertson, C. Flowers and insects, XXI. Data of anthecology. 
Bot. Gaz. 73: 148-152. 15 F 1922. 
Robertson, C. Flower seasons. Sci. Mo. 14: 201-203. F 1922. 
Robertson, C. The sunflower and its insect visitors. Ecology 
3: 17-21. (84 Mr 1092 
Rock, J. F. Hunting the chaulmoogra tree. Nat. Geog. Mag. 
41: 243-276. Mr 1922. [Illust.] 
Taraktogenos Kurzit of Siam. 
Rothgeb, B. E. Cultural experiments with grain sorghums in 
the Texas panhandle. U.S. Dept. Agr. Bull. 976: 1-43. 
f. I-11. 20 Ja 1922, 
307 
