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This happens frequently in seedling plants of Anagallis arvensis_, Euphorbia peplus_, and other species, Linaria vulgaris_, some Umbelliferć_, &c.;[151 Adventitious formation of leaves.=--The term phyllomania has been vaguely applied both to the production of an unwonted number of leaves and to their development in unusual situations.— Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
210.--Section through base of midrib of cabbage leaf, showing supplementary laminć, &c The development of secondary leaves from the surfaces of primary ones (phyllomania, autophyllogeny) has already been alluded to at p. 355 Some of the cases wherein a leaf seems to have a double lamina may be alluded to here, though possibly they would more properly be referred to fission.— Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
In the adult state it is not always possible to ascertain with certainty to which of these causes the increase in the number of leaves is due, though a clue to the real state of things may be gained from attention to the distribution of the veins, to the arrangement or phyllotaxy of the leaves, the size and position of the supernumerary organs, &c The term "phyllomania," as ordinarily used, is applied to an unwonted development of leafy tissue, as in some begonias where the scales or ramenta are replaced by small leaflets, or as in some cabbage leaves, from the surface of which project, at right angles to the primary plane, other secondary leafy plates; but these are, strictly speaking, cases of hypertrophy (see Hypertrophy Those instances in which the actual number of leaves is increased, so that in place of one there are more leaflets, may be included under the term "pleiophylly," which may serve to designate both the appearance of two or more leaves in the place usually occupied by a single one, and also those normally compound leaves in which the number of leaflets is greater than usual The increased number of leaves in a whorl may well be designated as "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 Illustration: FIG.— Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
= -- The term phyllomania has been vaguely applied both to the production of an unwonted number of leaves and to their development in unusual situations.— Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
The term "phyllomania," as ordinarily used, is applied to an unwonted development of leafy tissue, as in some begonias where the scales or ramenta are replaced by small leaflets, or as in some cabbage leaves, from the surface of which project, at right angles to the primary plane, other secondary leafy plates; but these are, strictly speaking, cases of hypertrophy (see Hypertrophy).— Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Century Dictionary (1)
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