Giraud, 'Bot. Soc. Edinb.,' Dec. 12, 1839, _Antirrhinum_. Dareste, 'Ann. Sc. Nat.,' ser. 2, 1842, xviii, p. 220, _Delphinium_. C. Morren, 'Fuchsia,' p. 90, _Calceolaria_, 'Bull. Acad. Belg.,' xx, part ii, p. 57; and E. Morren, 'Bull. Acad. Belg.,' 2nd ser., xix. p. 224, _Gloxinia_. Richard, 'Mém. Soc. d'hist. nat.,' ii, p. 212, tab. 3. Lindley, 'Journ. Linn. Soc.,' iii, p. 9, _Dendrobium_. Michalet, 'Bull. Soc, Bot. France,' vii, p. 625, _Betonica_. Gubler, 'Bull. Soc. Bot. Fr.,' ix, 81, 'Des anomalies aberrantes et regularisantes.' Reichenbach fil. 'De pollinis orchid. genesi ac structura,' 1852, _Oncidium_. Clos, 'Mém. Acad. Toulouse,' vi, 1862, _Salvia_. Caspary, 'Verhandl. Phys. OEkon. Gesell. Königsberg,' 1860, i, 59, _Columnea_. Bureau, 'Bull. Soc. Bot. Fr.,' 1861, vol. viii, p. 710, _Streptocarpus_. Darwin, 'Variation of Animals and Plants,' ii, pp. 59 and 396. Godron, 'Ex. Bull. Bot. Soc. Fr.,' xiv, p. 165, 'Rev. Bibl.,' _Wistaria_. Marchand, 'Adansonia,' iv, p. 172, _Lonicera_. Baillon, 'Adansonia,' v, p. 177, 'Sur la regularité transitoire de quelques fleurs irreg.,' shows that during the development of some flowers which begin and end by being irregular, there is an intermediate state when all the parts are regular. Helye, 'Revue Horticole,' Sept., 1868, p. 327. In this last paper, published as this sheet is going through the press, the author states that he has raised from seed three generations of plants of _Antirrhinum_ with regular spur-less flowers. The original wild plant was only partially peloric, but all the flowers produced on its descendants were regular.
[221] "On the existence of two forms of Peloria," by M. T. Masters. 'Nat. Hist. Review,' April, 1863.
[223] Similar cases are figured in 'Hort. Eystettens. Ic. Pl. Vern.' fol. 4, f. 1, 2. _Viola martia_ multiplici flore.
[225] M. Bureau, 'Bull. Soc. Bot. Fr.,' ix, p. 91, describes two genera of _Bignoniaceæ_ in which the flowers are _normally_ regular and six parted.
[226] See 'Trans. Linn. Soc.,' vol. x. p. 227.
[227] 'Ann. Sc. Nat.,' ser. 4, 1859. tom. xi, p. 264, tab. 3.
[229] Marchand, 'Adansonia,' vol. iv, p. 127.
[230] 'Bull. Acad. Belg.,' xvii. p. 17. "Fuchsia," p. 169.
Most irregular flowers owe their irregularity to an unequal development of some of their organs as compared with that of others. When such flowers become exceptionally regular they do so either because development does not keep pace with growth, and a regular flower is thus the result of an arrest of the former process (regular peloria), or because the comparatively excessive development, which usually occurs in a few parts is, in exceptional cases manifested by all, hence the flower becomes regular from the increase in number of its irregular elements. These latter cases, then, are due to an excess of development, hence the application of the term pleiomorphy. It must be understood that mere increase in the number of the organs of a flower is not included under this head, but under that of deviations from the ordinary number of parts.