280 INDEX TO AMERICAN BOTANICAL LITERATURE 
Sampson, H. C. An ecological survey of the prairie vegetation 
of Illinois. Bull. Illinois Nat. Hist. Surv. 13: 523-577. pl. 
48-77 + f. 1-8 + maps I-3. Au 1921. 
Saunders, E. R. Address to the Botanical Section [British 
Association for the Advancement of Science, 1920]. British 
Assoc. Adv. Sci. Rep. 88: 169-190. 1920. 
A genetical address. 
Sax, K. Sterility in wheat hybrids. I. Sterility relationships 
and endosperm development. Genetics 6: 399-416. Jl 1921. 
Scala, A. C. Contribucién al estudio histolégico de la flora 
chilena. Revista Chilena Hist. Nat. 24: 73-78. f. 5-7. 31 Au 
1920. 
Schiiroff, P. N. Die Teilung des vegetativen Pollenkerns bei 
Eichhornia crasstpes. Ber. Deutsch. Bot. Ges. 40: 60-63. 
fe Pe 25 FF 1gz2. 
Serre, P. La culture du cacaoyer au Costa-Rica. Bull. Mus. 
Hist. Natur. 1921: 260-264. 
Showalter, A.M. An orthotropous ovule in Hyacinthus orientalis 
Ls Torreya 21+ 62,64. f. 7, 2. Aw’ 1921. 
Silveira, A. A. Especies novae civitatis Minas Geraes |Brazil}. 
Arch. Mus. Nac. [Brazil] 23: 159-171. pl. 1-5. 1921. 
New species in Aspidosperma (1), Eriocaulon (4). 
Small, J. K. Seminole bread—the conti. A history of the genus 
Zamia in Florida. Jour. New York Bot. Gard. 22: 121-137. 
pl. 258-259. 1921. 
Includes Zamia umbrosa, sp. nov. 
Smith, C. P. Studies in the genus Lupinus—VI. The Stiver- 
stant, Concinni and Subcarnost. Bull. Torrey Club. 48: 
219-234. 07-74. 210: 1921; : 
Smith,A.L. Lichens. Pp. 1-464. f. 1-135. | Cambridge, 
England. 1921. Inseries of Cambridge Botanical Handbooks. 
Smith, L. Sugar cane in St. Croix. Virgin Is. Agr. Exp. Sta. 
ce 2s es. Bd fo 1921. 
Spegazzini, C. Mycetes chilenses. Bol. Acad. Nac. Ci. [Are- 
entina] 25: 1-124. 1921. [Illust.] 
Includes 5 genera and 113 new specie and forms of Fungi. 
