20 BULLETIN 971, U. S. DEPARTMENT OF AGRICULTURE. 
ramose condition is common, and occasionally plants have the typical 
ramose staminate inflorescences 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 the 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) Geknekt, Waltek 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 Naturl. Pflanzenfamilien . . . 
von A. Engler und K. Prantl, Teil 2, Abt. 2, p. 1-97, 126-130, 
308 figs., 1 pi. 
WASHINGTON : GOVERNMENT PRINTING OFFICE : 1921 
