INDEX TO AMERICAN BOTANICAL LITERATURE ooo 
Nichols, G.E. Raised bogs in eastern Maine. Geog. Rev: 7: 159-167. 
Tod, Bear FOt0. 
Orton, C. R., & Kern, F. D. The potato wart disease. Pennsylvania 
Agr. Exp. Sta. Bull. 156: 1-16. f. 7-4. Mr 1919. 
Pennell, F. W. Eysenhardtia. N. Am. Fl. 24: 34-40. 25 Ap 1919. 
Seven new species are described. 
Piper, C. V. New Pacific coast plants. Proc. Biol. Soc. Washington 
32: 41-44. 11 Ap 1919 
Includes Cryptantha suffruticosa, Sidalcea nelsoniana, Stachys caurina, S. con- 
fertiflora, S. ciliata macrantha, Penstemon deserticola, and Circium oreganum, spp. nov. 
Popenoe, W. The avacadoin Guatemala. U.S. Dept. Agr. Bull. 743: 
I-69. pl. 1-23. 17 Ap 1919. : 
Pomeroy, C. S. Bud variations in sugar cane. Jour. Heredity 1o: 
129-135. f. 16, 17. 25 Ap 1919. 
Reed, H. S., & Holland,R. H. The growth rate of an annual plant 
Helianthus. Proc. Nat. Acad. Sci. 5: 135-144. f. 1-3. Ap 1919. 
Roberts, H. F. The founders of the art of breeding. Jour. Heredity 
10: 99-106. f. 1-4. 25 Ap 1919; II. Jour. Heredity 10: 147-152. 
f. 1 + frontispiece. 26 My 1919; III. Jour. Heredity 10: 229-239. 
f. I-20. 15 Jl 1919. 
Robinson, B. L. An unusual Daucus Carota. Rhodora 21: 70, 71. 
14 Ap 1919. 
Rock, J. F. A monographic study of the Hawaiian species of the tribe 
Lobelioideae family Campanulaceae. i-xvit+1-394. pl. 1-217. 1919. 
Includes new species in Lobelia (4) and Cyanea (2). 
Rolfe,R: A. Govenia lagenophora. Curt. Bot. Mag. IV. 15: pl. 8794. 
Mr 1919. 
A plant from Mexico. 
Rolfe, R. A. Jsabelia virginalis. Curt. Bot. Mag. IV. 15: pl. 8787. 
Mr 1919. 
A plant from Brazil. 
Rose, R. C. After-ripening and germination of seeds of Tilia, Sam- 
bucus, and Rubus. Bot. Gaz. 67: 281-308. 18 Ap 1919. 
Rosendahl, C. O. Variations in the flowers of Erythronium propullans 
Gray. Torreya 19: 43-47. f. 1-3. 14 My I919. 
Rowlee, W. W. Synopsis of the genus Ochroma, with descriptions of 
new species. Jour. Washington Acad. Sci. 9: 157-167. 19 Mr 
1919. 
Six new species are described. 
Rydberg, P. A. Key to the Rocky Mountain Flora. 1-305. New 
York. 1919. i-xiiit+1-216. pl. 1-4. 1919. 
