INDEX TO AMERICAN BOTANICAL LITERATURE 49 
Saccardo, P. A. Mycetes Boreali-Americani a cl. Doct. J. R. Weir 
(Spokane, Washington) an. I communicati. Nuov. 
Giorn. Bot. Ital. II. 27: 75-88. D 1920. 
Includes 30 new species. 
Sanders, E. M. The natural regions of Mexico. Geog. Rev. 11: 212- 
226. fs 1-5. Ap 1921. 
Includes a vegetation map of Mexico. 
Savelli, R. Anomalie delle plantule e anomalie di germinazione in 
Nicotiana. Nuov. Giorn. Bot. Ital. II. 27: 129-153. D 1920. 
Schaffner, J. H. Additions to the catalog of Ohio vascular plants for 
1920. Ohio Jour. Sci. 21: 128-135. F 1921. 
Schaffner, J. H. Reversal of the sexual state in certain types of 
monecious inflorescences. Ohio Jour. Sci. 21: 185~198. pl. 1, 2. 
Ap 1921. 
Schill, J. F. Crassulacea-Statistiek en geografischeverspreiding (1737- 
1910). Succulenta 3: 12-15. 9 Mr 1921. 
Schlechter, R. Die Gattung Promenaea Ldl. Notizbl. Bot. Gart. 
und Mus. Berlin-Dahlem 7: 467-481. 1 Mr 1921. 
Includes 5 new species from Brazil. 
Schlechter, R. Uber einige neue Orchidaceen aus Colombia. Notizbl. 
- Bot. Gart. und Mus. Berlin-Dahlem 7: 527-532. 1 Mr 1921. 
New species in Stelis (1), Pleurothallis (4), Epidendrum (1). 
Schultz, E. S., & Folsom, D. Leafroll, net-necrosis and spindling- 
sprout of the Irish potato. Jour. Agr. Research 21: 47-80. pl. 1-12. 
1 Ap 1921. 
Scofield, C. S. Cotton rootrot in the San Antonio rotations. Jour. 
Agr. Research 21: 117-125. 2 My 1921. 
Sears, P. B. Vegetation mapping. Science II. 53: 325, 326. 8 Ap 
s0e7. 
[Shantz, H. L]. Botanical collecting in Africa [1919, 1920]. Smithson. 
Misc. Coll. 72°: 31-38. f. 44-49. 1921: 
Shaw,G.R. The genus Pinus. Publ. Arnold Arbor. 5: 1-96. pl. 1-39. 
1914. 
Shreve, E. B. The daily march of transpiration in a desert perennial. 
Carnegie {nstit. Washington Publ. 194: 1-64. pl. 1 +f. 1-27. 13 
Ap 1914. : 
Shreve, F.. The vegetation of a desert mountain range as conditioned 
by climatic factors. Carnegie Instit. Washington Publ. 217: 1-112. 
pl. 1-36 +f. 1-18. 280 1915. See 
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