PLANT Cotors IN MAaAIze 13 
plants ordinarily have considerable color at the base of the lower sheaths, 
but little or no color except green in other parts except in the margins of 
the leaves (Plate IX, 1). When the plants are grown on infertile soil, 
much bright red color develops in all parts exposed to light except the 
youngest leaves (Plate IX, 2). The seedlings and the very young plants 
are not ordinarily distinguishable from those of types Ia, Ila, and IIIa. 
Some time before the flowering stage, the plants of this type are sharply 
differentiated from those of types Ia and Ila, and are usually somewhat 
less highly colored than those of type IIIa. In normally grown plants, 
the color is confined mostly to the brace roots, and to the sheaths and the 
exposed parts of the culm at the base of the plants. Even at the flowering 
stage almost no color is seen in the upper sheaths or the upper part of the 
culm, and very little in the husks (Plate VI, 1). The staminate inflores- 
cense is colored much as is that of the sun red type, tho the glumes are 
lighter than those of type Ila and the rachis is usually nearly devoid of 
color. The anthers show more or less pink, as do those of type IIa. 
There is much variation in the extent and intensity of pigmentation of 
glumes and anthers (Plate III, 2, 3, and 4), due in part to genetic differ- 
ences and in part probably to environmental influences. Late in the 
life of the plant, type [Va usually shows some color in the outer husks and 
also in exposed parts of the culm. Different strains show considerable 
variation in this respect (Plate VI, 1 and 2). Due to the slight develop- 
ment of pigment and because of weathering, the dry parts of mature 
plants show little red color (Plate VII, 6). Light is essential to the 
development of color in dilute sun red, IVa, Just as in sun red, Ila. The 
aleurone and pericarp colors of dilute sun red, IVa, are the same as those 
of sun red, ITa. 
A wholly green type, that is, one devoid of pigment other than green 
in the plant parts here under consideration, is closely related genetically 
to type IVa and is therefore known as type IVg (Plate II, 4). Phenotypi- 
cally it is the same as type IIIg. Just as in case of types Ig, I, IIIg, and 
IVa, the pericarp of IVg is either red or colorless, never cherry, and the 
aleurone is either purple, red, or colorless. Genotypic diversities in the 
amount of color are noted for type IVa above. The lightest types of 
dilute sun red show no color except mere traces of red in the staminate 
spikelets. This condition is found in most plants of at least two varieties 
of sweet corn, Black Mexican and Crosby. From these varieties there 
