328 INDEX TO AMERICAN BOTANICAL LITERATURE 
Ruth, W. A. The effect of Bordeaux mixture upon the chloro- 
phyll content of the primordial leaves of the common bean, 
Phaseolus vulgaris L. Am. Jour. Bot. 9: 535-550. 1922. 
Rydberg, P. A. Flora of the Rocky Mountains and adjacent 
plains. Ed. II. Pp. i-xii + 1-1143. New York. 1922. 
Includes new species in Celtis (1), Cartiera (1), Xylophacos (1), Homalobus 
(1), and Comandra (1). 
Rydberg, P. A. Galegeae (pars). N. Am. Fl. 24: 155-200. 
16 Jl 1923. 
Includes new species in Cracca (13) and Brongniartia (8). 
Samuelsson, G. Revision der potatoes eee 
arten. Svensk Bot. Tidskr. 17: 241-296. 
Includes 15 new species from South America. 
Sartory, A., & Maire, L. Compendium Hymenomycetum. 
Amanita. Pp. 1-318. Paris, France. 1922-1923. [Il- 
lust.] 
Sax, K. The association of size differences with seed-coat 
pattern and pigmentation in Phaseolus vulgaris. Genetics 
8: 552-560. N 1923. 
Scala, A. C. Contribucién al conocimiento histologico de la 
yerba-mate y sus falsificaciones. Rev. Mus. La Plata 26: 
69-165. f. I-142. 1922. 
Study of Ilex paraguayensis. 
Schaffner, J. H. Additions to the catalog of Ohio vascular 
plants for 1922. Ohio Jour. Sci. 23: 107-114. Ap 1923. 
Schmidt, D. The relation of seed weight to the growth of buck- 
wheat in culture solution. Soil Sci. 15: 285-292. Ap 1923. 
Schiirhoff, P.N. Zur Apogamie von Calycanthus. Flora 116: 
73-84. 1923. 
Scouvart, A. Les arbres géants de la Californie. Bull. Soc. 
Roy. Bot. Belgique 55: 73-86. pl. 2, 3. 1923. 
Shantz, H. L. The natural vegetation of the Great Plains 
region. Ann. Assoc. Am. Geog. 13: 81-107. pl. 3-8. Je 
1923. 
