from The Century Dictionary and Cyclopedia
- n. In botany, an increase in the number of members or organs in a whorl, as when a normally pentamerous calyx has six or more sepals, as is occasionally the case in the plum. Foliage, leaves, and all the parts of the flowers may be so affected.
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The distinction between the two modes in which the parts of the flower are increased in number has been pointed out by Engelmann, Moquin, and others, and the two seem to require distinctive epithets; hence the application of the terms polyphylly and pleiotaxy, as here proposed.
"polyphylly," using the word in the same sense as in ordinary descriptive botany, while "pleiotaxy" may be applied to those cases in which the number of whorls is increased.
Most of these cases of polyphylly affecting the calyx may be explained by lateral chorisis or fission.
Gynoecium (see pistils) enlargement of, 430 meiophylly of, 399 meiotaxy of, 406 pleiotaxy of, 388 polyphylly of, 363 suppression of, 406