520 InDEx TO AMERICAN BOTANICAL LITERATURE 
Robinson, B. L. & Greenman, J. M. Revision of the Mexican and 
Central American species of Hieracium. Proc. Am. Acad. Arts & 
Sci. 40: 14-24. 18 Jl 1904. 
With descriptions of 5 new species. 
Robinson, B. L. & Greenman, J. M. Revision of the Mexican and 
Central American species of Zyixis. Proc. Am. Acad. Arts & Sci. 
40: 6-14. 18 Jl 1904. 
With descriptions of 5 new species. 
Rosenstock, E. Beitrige zur Pteridophytenflora Siidbrasiliens. Hed- 
wigia, 43: 210-238. 12 Je 1904. 
Includes new species in Asplenium, Nephrodium and Selaginella (2). 
Russell, H. L. Black rot of cabbage. Ann. Rep. Wis. Agric. Exp. 
Sta. 20: 259-262. f. 25, 26. 1904. 
Rydberg, P. A. Studies on the Rocky Mountain flora—XI. Bull. 
Torrey Club, 31: 399-410. 29 Jl 1904. 
With descriptions of 25 new species and varieties in 16 genera. 
Sandsten, E. P. Spraying fruit trees. With notes on the common 
insects and fungus diseases infesting orchards. Wis. Agric. Exp. 
Sta. Bull. 110: 1-28. f. 72. Ap 1904. 
Sanford, S.N. F. The occurrence of Verbena stricta and Helianthus 
mollis in Massachusetts. Rhodora, 6: 88, 89. 2 My 1904. 
Saunders, C. E. Notes on some variations in the second generation 
of Berberis hybrids. Mem. Hort. Soc. N. Y. 1: 167, 168. [1904-] 
Saunders, W. Results of hybridization and plant breeding in Canada. 
Mem. Hort. Soc. N. Y. 1: 125-141. [1904.] 
Schaffner, J. H. Deciduous leaves. Ohio Nat. 4: 163-166. 1 My 
1904. 
Schaffner, J. H. The jacket layer in Sassafras. Ohio Nat. 4: 19?) 
193. Fits 5 Fe 1904. 
Schiffner, V. Beitrage zur Aufklarung einer polymorphen Arten- 
gruppe der Lebermoose. Verh. Zool.-bot. Gesells. Wien, 54: age 
405. 30 J] 1904. 
Schneider, A. A guide to the study of lichens. Ed. 2. i-xii. 1-234 
pl. 1, ra-1d, 2-6, 1-11. Boston, 1904. 
Schumann, K. Mais und Teosinte. Festschr. 7o-ten Geburtst. Aschet 
son, 137-157. 1904. 
Selby, A.D. Peach diseases III. Ohio Agric. Exp. Sta. Bull. 148? 
55-67. pl. 1-7. F 1904. 
Peach leaf-curl and scab. 
Seler, E. Zwei Friihlingsmonate in Yucatan. Festschr. 70-t€? 
Geburtst. Ascherson, 371-382. 1904. 
