Q: Inter-species crossing
sphinkson at worldnet.att.net
Wed Sep 1 04:43:42 EST 1999
Then we have it, Roger.
By Steve's definition all sexual reproduction of non-clone plants result in a
hybrid, and by yours, intergeneric crosses aren't hybrids.
Love the silliness !
Roger Van Loon wrote:
> Stephen M Jankalski wrote:
> > Dear Roger,
> > That is not correct because a hybrid can even be crosses between two
> > subspecies, varieties, forms or even races of the same species. The point
> > being that a hybrid is a cross between two different plants regardless of
> > their taxonomic ranking.
> Then I must conclude that, according to that definition, practically all
> existing plants in the plant kingdom are hybrids. Indeed: every existing
> plant is a cross between two different plants. (Excluding plants that
> are self-pollinated, vegetatively propagated, or the result of
> parthenocarpic seed, I would say).
> Now just an example: in the very many books I have on Camellia's, it is
> always carefully explained that the more than a thousand existing
> varieties of Camellia japonica (mostly the result of crosses within the
> species, made hundreds of years ago) are varieties and NOT hybrids. It
> is always explained that the first Camellia hybrids were produced within
> this century, when the first crosses between the different species of
> Camellia were made (C. Japonica x C. Saluenensis etc.etc.) Same for
> other genera.
> > Check the International Code of Botanical Nomenclature, Appendix I, on the
> > naming of hybrids, particularly article H.10.
> You mean the Tokyo code of 1994.
> Well - I do not find there any definition of a hybrid. It is true that
> said article deals with "Names of hybrids" and that within the article
> mention is made of " names of nothotaxa at the rank of species and
> below". But can you tell me where I can find in this code a definition
> of a hybrid?
> I fear botanist are once again changing the rules and making things more
> complicated than necessary. In the meantime, I'll just follow the books
> in my library, where I find (for example) the following definitions of a
> - The RHS Dictionary of Gardening:
> ""Hybrid: a plant raised by crossing 2 species"" (what could be
> - The Collingridge Encyclopedia of Gardening:
> ""Hybrid: ...For the purpose of botanical nomenclature, the term is
> confined to the progeny of crosses between distinct species or genera.""
> (Isn't that what we are talking about?)
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