2. Late plants. Two second generation inbred lines segregated for late-maturing plants in 194O, but there were numerous differences between the late segregates of one culture and those of the second culture. Inbred line number 40-156 consisted of 10 plants of which 8 grew normally and produced ears, one grew about 7 months without shedding pollen, and one which was apparently a late type was broken by a workman. Inbred line number 40-290 consisted of 5 plants of which 3 were like the normal plants of 40-156 and two were late like those of the other culture but differed from them in that they were dwarfs instead of giants.


Culture Type of Plant Days to Pollen Total number of nodes Nodes with
brace roots above ground
Height cm. Length of
first 5 internodes cm
circumference of
first 5 internodes cm
40-156 Late 207++ 26 15 255 11.0 10.8
40-156 Normal 104 14 1 184 12.6 7.3
40-290 Normal 98 13 1 175 12.0 7.1
40-290 Late 207++ 21 11 33 1.2 6.0


The late types died about January 15, 1941 from lack of water. The giant plant from culture 40-156 subdivided near its top, producing 10 branches each of which contained a small tassel that was nearly exposed at the time the plant died. This giant type may be the same mutant character that was originally reported by Brunson and has since appeared in the cultures of Bryan and Emerson.

The dwarf type of late plant in culture 40-290 still had its tassel deeply enclosed in the leaves when it died from lack of water. Perhaps this mutant form of plant is the same as the one described by Antonio E. Marino in "Una variacion tardia' en maiz" (A late variation in maize), Revista Argentina Agron. 6 (3):, 237-240, 1939.