any species reproduce only asexually?

Cereoid+1+ cereoid at prodigy.net
Tue Aug 6 21:00:50 EST 2002


Absolutely untrue.

You never heard of multiplication by division?

Most plants in the horticultural trade are propagated entirely by asexual
means.


David Hershey <dh321 at excite.com> wrote in message
news:7039c6ef.0208061750.52c787fc at posting.google.com...
> Plants that cannot sexually reproduce at all are fairly rare.
>
> There are some fern species, such as Vittaria appalachiana, that exist
> only as tiny gametophytes, which reproduce only asexually. They never
> form the larger sporophytes which are what we think of as the typical
> fern plants.
> http://www.ibiblio.org/unc-biology/herbarium/weakley/Vittar.html
> http://www.goldsword.com/sfarmer/ATBI/gametophyte-gallery.html
>
> There is a cycad species, Encephalartos woodii, in which only a single
> male plant survived in the wild. It has been reproduced by offsets and
> still survives in many botanic gardens.
> http://www.plantzafrica.com/plantefg/encephwoodii.htm
>
> King's holly (Lomatia tasmania) exists in the wild as a single
> specimen that reproduces only asexually because it is triploid. It is
> thought to be as much as 43,000 years old.
> http://www.ou.edu/cas/botany-micro/ben/ben149.html
>
> Genetically seedless fruit, such as seedless grapes, cultivated banana
> and navel oranges cannot set viable seed so have to be asexually
> propagated.
>
> David R. Hershey
>
>
> "Tristan" <hamlet2b at videotron.ca> wrote in message
news:<hkI39.2721$qu1.136901 at weber.videotron.net>...
> > Hello,
> >
> > I have been debating with a friend about whether or not any plants
reproduce
> > only asexually, or whether all plants have some mechanism of sexual
> > reproduction.  Our research has unveiled many forms of asexual
reproduction,
> > but there is usually an implication that the same plants also reproduce
> > sexually.  Are there any species anyone knows of that reproduce only
> > asexually?
> >
> > Thanks





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