120 INDEX TO AMERICAN BOTANICAL LITERATURE 
Roberts, H. F. Relation of hardness and other factors to 
protein content of wheat. Jour. Agr. Research 21: 507- 
522. pl. roo. 15 Jl 1921. 
Rock, J. F. The Okala berry of Hawaii. Jour. Hered. 12: 
147-150. f. 7, 2. Ap 1921. 
Roig, J. F., Cremata, M., & Bruner, S.C. Exploracién botanica 
en la Cienaga de Zapata [Cuba]. Revista Agr. Com. & 
Trab. 3: 213-221. Jl. 1920. [With map.] 
Safford, W. E. Datura, an inviting genus for the study of 
heredity. Jour. Hered. 12: 178-190. f. ro-16. Ap 1921. 
Shufeldt, R. W. Common American mushrooms. Am. For. 
27: 579-587. f. 1-13. S 1921. 
Smith, E. F. Effect of crowngall inoculations on Bryophyllum. 
Jour. Agr. Research 21: 593-597. pl. ror—-r110. 15 Jl 192I. 
Snell, W. H. Chlamydospores of Fomes officinalis in nature. 
Phytopathology 11: 173-175. f.z. Ap 1921. 
Sprague, T. A. A revision of the genus Capraria. Kew Bull. 
Misc. Inform. 1921: 205-212. I92I. 
Sprague, [T. A.]. Begonia (Gireoudia) trigonoptera, Sprague 
[Begoniaceae]. Kew Bull. Misc. Inform. 1921: 218, 219. 
1921 
New species from Guatemala, 
S[prague], T. A. The generic name Wikstroemia. Kew Bull. 
isc. Inform. 1921: 175, 176. 1921. 
Sprague, T. A., & Riley, L.A. M. Notes on Raimanniaand allied 
genera. Kew Bull. Misc. Inform. 1921: 198-201. 1921. 
Includes nine new combinations. 
Taylor, N. The flora above the timber line of Mount Marcy. 
Am. Scien. & Hist. Preserv. Soc. Ann. Rep. 25: 317, 318- 
1920. 
Thatcher, L. E. A fungus disease suppressing expression of 
awns in a wheat-spelt hybrid. Jour. Agr. Research 21: 
699, 700. pl. 135. 15 Au Ig2t. 
Theye, C. Nutricién nitrogenada de los vegetales. Revista 
Facult. Letr. y Cienc. Univ. Habana 31: 145-151. Je 1921. 
Thurston, H. W., & Orton, C. R. A Phytophthora parasitic 
on peony. Science II. 54: 170, 171. 26 Au 1921. 
Tisdale, W. H. Two Sclerotium diseases of rice. Jour. Agr- 
Research 21: 649-657. pl. 122-126. 1 Au 1921. 
