INDEX TO AMERICAN BOTANICAL LITERATURE 281 
Spegazzini, C. Una nueva especie argentina del genero “ Pro- 
sopanche.”’ Anal. Soc. Ci. Argentina 92: 251-256. f. 1-4. 
D 1921 
Prosopanche Mazzuchii sp. nov. 
Spegazzini, C. Plantas nuevas o interesantes. Anal. Soc. Ci 
Argentinisa 92: 77-123. S Igat. 
Includes new species in Atriplex (1), Portulaca (2), Talinum (1), Echin- 
ocactus (1). 
Sprague, T. A. Alphabetical list of nomina conservanda [Phan- 
erogamae]. Kew Bull. Misc. Inform. 1921: 321-326. 1921. 
Sprague, T. A. A revision of the genus Belotia. Kew Bull. Misc. 
Inform. 1921: 270-278. 1921. 
Includes 5 new species from tropical America. 
Sprague [T. A.| & Riley [ |. Petastoma Broadwayi, Sprague 
et Riley [Bignoniaceae]. Kew Bull. Misc. Inform. 1921: 
S14, ia 1971. 
Sprague [T. A.]. Rinorea Hummelii, Sprague [Violaceae]. Kew 
Bull. Misc. Inform. 1921: 307, 308. 1921. 
Stevens, O. A. Pants of Fargo, North Dakota, with dates of 
flowering Am. Midl. Nat. 7: 135-156. S 1921 
Stewart, F. C. The velvet-stemmed Collybia—a wild winter 
mushroom. Ann. Rep. (Geneva) New York Agr. Exp. Sta. 
37: 208-227. 1919. [Illust.] 
St. John, H. A critical revision of Hydrangea arborescens. 
Rhodora 23: 203-208. 9 Ja 1922. 
Stout, A. B. Sterility and fertility in a of Hemerocallis. 
Torreya 21: 57-62. f. 1-8. Au 192 
Stout, A. B. Studies of grapes in cooperation with the State 
Experiment Station at Geneva, N. Y. Jour. New York 
Bot. Gard. 22: 148-156. pl. 262. My 1921. 
Tahara, M. Cytologische Studien an einigen Kompositen. 
Jour. Coll. Sci. Tokyo Imper. Univ. 437: 1-53. pl. 1-4. 
30 Mr 1921. 
Tilden, J. E. The study of Pacific Ocean algae. Proc. Pan-Pacif. 
Sci. Confer. 1: 207-209. 1921. 
