34 INDEX TO AMERICAN BOTANICAL LITERATURE 
Santos, J. K. Differentiation among chromosomes in Elodea. 
Bot. Gaz. 75:.42-59. pl. 3.. 23 Mr 1923. 
Sargent, F. H. Euphrasia canadensis in Vermont. Rhodora 
25: 84. 24° Ap 1923. 
Sargent, F. L. Trees that feed upon themselves. Nat. Mag. 
1: 55, 56. Mr 1923. 
Schaffner, J. H. Additions to the catalog of Ohio vascular 
plants for 1922. Ohio Jour. Sci. 23: 107-114. Ap 1923. 
Seifriz, W. Observations on the cause of gregarious flowering 
in plants. Am. Jour. Bot. 10: 93-112. pl. 12. 2 Mr 1923. 
Setchell, W.A. Dumontia filiformis on the New England coast. 
Rhodora 25: 33-37. 6 Mr 1923. 
Sewell, M. C. Effect of Andropogon Sorghum on succeeding 
crops of Triticum sativum. Bot. Gaz. 75: 1-26. f. I-II. 
23 Mr 1923. 
Sherman. J. M., & Albus, W. R. Pasar: youth in bacteria. 
Jour. Bact. 8: 127-140. Mr 
Showalter, A.M. The chromosomes of cae pinguis. Am. 
Jour. Bot. 10: 170-172. pl. 20. 18 Ap 1923. 
Showalter, A. M. Studies in the morphology of Riccardia 
pinguis. Am. Jour. Bot. 10: 148-166. pl. 16-19 + f. I-3. 
30 Mr 1923. 
Shull, G. H. Further evidence of linkage with crossing over in 
Oenothera. Genetics 8: 154-167. Mr 1923 
Siegler, E. A., & Jenkins, A. E. Sclerotinia carunculoides, the 
cause of a serious disease of the mulberry (Morus alba). 
Jour. Agr. Research 23: 833-836. pl. 1, 2. 10 Mr 1923. 
Small, J. K. The Austrian field-cress again. Torreya 23: 23- 
25. 1923. 
Radicula austriaca (Crantz) Small. 
Snethlage, E. H. Neue Arten der Geattung Cecropia nekst 
Beitragen zu ihrer Synonymik. Notizbl. Bot. Gart. u. 
Mus. Berlin-Dahlem 8: 357-369. 15 Ap 1923. 
Includes 13 new species from Tropical America 
