INDEX TO AMERICAN BOTANICAL LITERATURE 45 
Earle, F. S. La extirpacién del mosaico de la cafia como medio de 
represién. Puerto Rico Dept. Agric. y Trab. Bol. 22: I-19. Ja 1920. 
Farr, W. K. Cell-division of the pollen-mother-cell of Cobaea scandens 
alba. Bull. Torrey Club 47: 325-328. pl. 14. 5 O 1920. 
Farwell, O. A. Notes on the Michigan flora II. Michigan Acad. Sci. 
Rept. 21: 345-371. 1919. 
Includes many new varieties, combinations and forms. 1919. 
Figueroa, C. A. El matizado de la cafia de azticar y la produccién de 
azucar en Puerto Rico. Rev. Agric. Puerto Rico §: 25-31. 30S 
1920. 
Forbes, C. N. Notes on Marsilea villosa Kaulf. Occ. Papers Bishop 
Mus. 7: 47-49. pl. 13-14. 1920. 
Forbes, C. N. New Hawaiian Plants. VII. Occ. Papers Bishop 
Mus. 7: 33-39. pl. 3-11. 1920. 
7 new species. 
Forbes, C. N., & Munro, G. C. A new Cyanea from Lanai, Hawaii. 
Occ. Papers Bishop Mus. 7: 43. pl. 12. 1920. 
Gager, C. S. Heredity and evolution in plants. i-xiii + 1-265. 
Philadelphia. 1920. 
Gassner, G. Beitrage zur Frage der Uberwinterung und Verbreitung 
der Getreideroste im subtropischen Klima. Zeitschr. Pflanzenkr. 
26: 329-374. 16S 1916. 
Observations made in Uruguay. 
Grier, N. M. Notes on ee. regeneration in Elodea and 
Ceratophyllum. Am. Bot. 26: 8 
Harlan, H. V., & Hayes, H. K. Occurrence of the fixed intermediate, _ 
Hordeum intermedium haxtoni, in crosses between H. vulgare pallidum 
and JH. distichon palmella. Jour. Agr. Research 19: 575-591. pl. 
I03-106. 1S 1920. 
. Harvey, R.B. Some enemies of the potato. Sci. Am. Mo. 2: 120-122. 
f. 1-9. O 1920. 
Hastings,G.T. The vegetation of a cinder field. Torreya 20: 96-100. 
1920. | 
Hayes, H.K. The inheritance of the length of internode in the rachis 
of the barley spike. U. S. Dept. Agr. Bull. 869: 1-26. pl. 1-2. 
30 S 1920. 
_ Hayes, H.K., Parker, J. H., & Kurtzweil, C. Genetics of rust resistance 
in crosses of varieties of Triticum-vulgare with varieties of T. durum 
and T. dicoccum. Jour. Agr. Research 19: 523-542. pl. 97-102 
1S 1920. 
