Excerpt from The Genetic Relations of Plant Colors in Maize
Under the designation plant colors are included the colors other than those related to chlorophyll, commonly seen in, but not limited to, such external plant parts of maize as the culm, the staminate inflorescence, the husks, the leaf sheaths, and to some extent the leaf blades. In con trast to this group are colors and color patterns related to chlorophyll or associated with the pericarp and the cob, the silks, the endosperm, the aleurone. The colors included in the group considered here are due to water-soluble pigments, but the same is true of some of the other color groups named above. Moreover, colors of the chlorophyll group (lind strom, 1918) are found in the same plant parts as are the plant colors considered in this account. The plant colors as a whole are closely interrelated, but they are closely related also to aleurone colors and to certain of the silk and pericarp colors. It is obvious, therefore, that, while this classification is a more or less natural one, it is based primarily on convenience.
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