After arriving at these conclusions, I was led to investigate a subject which throws considerable light on hybridism, namely, the fertility ofheterostyled or dimorphic and trimorphic plants, when illegitimately united.
In the very different case of trimorphic heterostyled plants, the two sets of stamens in the same flower have widely different fertilising powers.
Close correspondence between the effects of cross-fertilisation and self-fertilisation, and of the legitimate and illegitimate unions of heterostyled plants, in comparison with hybrid unions.
The ovules of a heterostyled trimorphic plant are affected very differently by pollen from the three sets of stamens belonging to the same species.
If one form is fertilised with pollen from the same form, the full complement of seed is not produced; and in the case of some heterostyled genera no seed at all is produced.
I have been particularly glad to receive your letter of March 25th on Pontederia, for I am now printing a small book on heterostyled plants, and on some allied subjects.
Lagerstraemia was doubtfully placed among the heterostyled plants ("Forms of Flowers," page 167).
I am especially glad that you have called attention to the parallelism between illegitimate offspring of heterostyled plants and hybrids.
I should be much obliged if you could without much trouble send me seeds of any heterostyled herbaceous plants (i.
In my new book I shall use all the information and specimens which you have sent me with respect to the heterostyled plants, and your published notices.
As before remarked, no little discovery of mine ever gave me so much pleasure as the making out the meaning of heterostyled flowers.
On the other hand, with heterostyled dimorphic species there are two females and two sets of males, and with trimorphic species three females and three sets of males, which differ essentially in their sexual powers.
From this fact we may infer that most of the genera have acquired their heterostyled structure independently of one another; that is, they have not inherited this structure from some one or even two or three progenitors in common.
The clear evidence that the species just described is heterostyled and trimorphic is the more valuable as there is some doubt with respect to P.
Hildebrand has published a full account of this heterostyled plant.
But the results are much more complicated than with ordinary plants, as two heterostyleddimorphic species can be intercrossed in eight different ways.
No less than twenty different crosses are necessary in order to ascertain fully the fertility of hybrid heterostyled plants, both inter se and with their two parent-species.
This plant, therefore, is in all respects a well-characterised heterostyled species.
The benefit which heterostyled dimorphic plants derive from the existence of the two forms is sufficiently obvious, namely, the intercrossing of distinct plants being thus ensured.
We know that in the two forms of our existing heterostyled plants the pistil always differs, and the stamens generally differ in length; so does the stigma in structure, the anthers in size, and the pollen-grains in diameter.
The observations on Linaria and the investigations of the results of legitimate and illegitimate fertilisation in heterostyled plants were apparently the beginning of a long series of experiments.
The heterostyled plants are normally dependent on a process corresponding to hybridisation.
The researches on which the conclusions rest had, in part at least, been previously published in separate papers: this is the case as regards the heterostyled plants.
This functional difference of sexual cells is characteristic of the behaviour of hybrids as of the illegitimate unions of heterostyled plants.
In the book containing the account of heterostyled plants other species are dealt with which, in addition to flowers opening normally (chasmogamous), also possess flowers which remain closed but are capable of producing fruit.
I imagine that it was his instinctive love of making out a difficulty which to a great extent kept him at work so patiently on the heterostyled plants.
Hybridisation, analogy of, with some forms of fertilisation of heterostyled plants, 312.
Heterostyled plants are comparable to hermaphrodite animals, such as snails, which require the concourse of two individuals, although each possesses both the sexual elements.
The result of his work on heterostyled plants is of importance as showing that sterility is no test of specific distinctness, and that it depends on differentiation of the sexual elements which is independent of any racial difference.
The work on heterostyled plants has a special bearing, to which the author attached much importance, on the problem of the origin of species.
The nature of heterostyled plants may be illustrated in the primrose, one of the best known examples of the class.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "heterostyled" in a variety of sentences. We hope that you will now be able to make sentences using this word.
