20 BULLETIN 971, U. S. DEPARTMENT OF AGRICULTURE. 



ramose condition is common, and occasionally plants have the typical 

 ramose staminate injfiorescences in combination with normal un- 

 branched ears. 



The appearance and behavior in inheritance of the intermediate 

 ramose plants suggest a relationship with branched forms from non- 

 ramose stocks and furnish evidences for the development of the 

 single-spiked ear through a reduction of branches. 



LITERATURE CITED. 



(1) Collins, G. N. 



1912. The origin of maize. In Jour. Wash, Acad. Sci., v. 2, no. 21, 

 p. 520-530. 



(2) 1917. Hybrids of Zea ramosa and Zea tunicata. In Jour. Agr. Re- 



search, V. 9, no. 11, p. 383-396, pi. 13-21. Literature cited, 

 p. 395. 



(3) 1919. Structure of tlie maize ear as indicated in Zea-Euchlaena hy- 



brids. In Jour. Agr. Research, v. 17, no. 3, p. 127-135, 1 fig., 

 pi. 16-18. 



(4) Gekneet, Walter B. 



1912. A new subspecies of Zea mays L. In Amer. Nat., v. 46, no. 550, 

 p. 616-622, illus. 



(5) Hackel, E. 



1887. Graminese (echte Graser). In Natiirl. Pflanzenfamilieh . . . 

 von A. Engler und K. Prantl, Teil 2, Abt. 2, p. 1-97, 126-130, 

 308 figs., 1 pi." 



WASHINGTON ; GOVEnNMBNT PRINTING OFFICE : 1921 



