INDEX TO AMERICAN BOTANICAL LITERATURE I2I 
Torres, L. G. Plantas forrajeras: una leguminosa forrajera 
indigena (Desmodium leiocarpum G. Don—Meibomia leiocar- 
pa). Revista Agricola 6: 84-86. Je 1921. [Illust.] 
Trelease, W. A natural group of unusual black oaks. Proc. 
Am. Philos. Soc. 60: 31-33. pl. 2-4. 10921. 
Includes 3 new species from Mexico. 
Uphof, J. C. T. Vegetationsbilder aus dem Staate Michigan. 
Vegetationsbilder 13: pl. 43-48. 1921 
Valdivia Montanez, M. A. El mani, su cultivo, productos y 
usos. Revista Agr. Com. y Trab. 1: 570-579. N 1918. 
[Illust.] 
Arachis hypogea L. 
Valencia, F. V. Mechanical tests of some commercial Philippine 
timbers. Philipp. Jour. Sci. 18: 485-535. pl. 1 +f. r-r0. 
My 1921. 
Vendrell, E. La seleccién de las semillas. Revista Agr. Com. 
y Trab. 1: 260, 261. My 10918. 
Verbeek Wolthuys, J. J. Pereskieae en Opuntieae. Floralia 
42: 373-375, 387-389. Je 1921. [Illust.] 
Visher, S.S. The geography of South Dakota. South Dakota 
Geol. & Nat. Hist. Surv. Bull. 8: 1-189. f. 1-52. Jl 1918. 
Contains chapter on biogeography. [Corrected reprint] 
Waby, J. Z. Some interesting species of palms. Jour. Board 
Agr. British Guiana 11: 172, 173. O 1918; 12: 188—-195. 
Jl 1919. 
Weimer, J. L., & Harter, L. L. Respiration and carbohydrate 
changes produced in sweet potatoes by Rhizopus Tritici. 
Jour. Agr. Research 21: 627-635. I Au 1921. 
Weimer, J. L., & Harter, L. L. Wound-cork formation in the 
sweet potato. Jour. Agr. Research 21: 637-647. 1 Au 
1921. 
Weir, J.R. Note on Cenangium abietis (Pers.) Rehm on Pinus 
ponderosa. Phytopathology 11: 166-170. f.z. Ap 1921. 
Weir, J. R., & Hubert, E. E. Forest disease surveys. U. S. 
Dept. Agr. Bull. 658: 1-23. f. 1-23. 12 Je 1918. 
Weiss, F., & Harvey,R.B. Catalose hydrogen-ion concentration 
and growth in the potato wart disease. Jour. Agr. Re- 
search 21: 589-592. 15 Jl 1921. 
