INDEX TO AMERICAN BOTANICAL LITERATURE 459 
Purdy, C. Pacific coast wild flowers: their history and cultivation. 
Jour. Internat. Gard. Club 3: 211-231. Je 1919. [Illust.] 
Ramsey, G. B. Studies on the viability of the potato blackleg or- 
ganism. Phytopathology 9: 285-288. Jl 19109. 
Record, S. J. Storied or tier-like structure of certain dicotyledonous 
woods. Bull. Torrey Club 46: 255-273. 31 Jl 1919. 
Reed, H. S. Growth and variability in Helianthus. Am. Jour. Bot. 
6: 252-271. f. 1-3. Jl 1919. 
Rehder, A. _ New species, varieties and combinations from the her- 
barium and the collections of the Arnold Arboretum. Jour. Arnold 
Arboretum 1: 44-60. Jl 1919. 
Taxus chinensis and Carpinus Handelii, spp. nov., are described. 
Roberts, H. F. The founders of the art of breeding—III. Jour. 
Heredity 10: 229-239. f. 20. 15 Jl 1919;—IV. Jour. Heredity ro: 
257-270. 15 Au 1919. 
Rolfe, R. A. »The true mahoganies. Kew Bull. Misc. Inf. 4: 201- 
207. I919. 
Rolfe, R. A. Wittia panamensis. Curt. Bot. Mag. IV. 15: pl. 8799- 
Je 1919. 
A plant from Panama. : 
{Rose, J. N.] Botanical exploration in Ecuador. Smithsonian Misc. 
Col. '70?: 43-50. f. 45-56. 1919. 
Sampson, H.C. An ecological survey of the vegetation of the Illinois 
prairie—a preliminary report. Trans. Illinois Acad. Sci. 9: 123- 
125; 1916, 
Sando, C. E. Endothia pigments—II. Endothine red. Am. Jour. 
Bot. 6: 242-251. f. 1-3. Jl 1919. 
Sargent, C. S. Notes on North American trees—V. Jour. Arnold 
Arboretum 1: 61-65. Jl 1919. 
Savage, T. E. On the conditions under which the vegetable matter of 
the Illinois coal beds accumulated. Trans. Illinois Acad. Sci. 7: 
100-110. 1914. 
Schneider, C. Bemerkungen zur Systematik der Gattung Betula 
L. Osterreichische Bot. Zeit. 65: 305-312. D 1915.. 
Schneider, C. Notes on American willows—V. The species of the 
lotr ta group. Jour. ise Arboretum. 1: 1-32. Jl 1919. 
isonti sp. nov. is descri 
CBS C. Uber die ue Gliederung der Gattung Salix. 
Osterreichische Bot. Zeit. 65: 273-278. D 1915. 
