There are hundreds of examples of "wide" crosses in Cactaceae. The so called
"Epiphyllum" hybrids are actually complex crosses between Heliocereus,
Nopalxochia, Disocactus, Selenicereus, and Hylocereus but rarely are the
true Epiphyllum species used other than day blooming E.crenatum. Hybrids are
usually intermediate in appearance between the parents but there are
exceptions, especially when one of the parents is polyploid.


Gabriel wrote in message
om...
A few years ago, I have seen a documentary film about a plant in
Hawaii, I could not remember it's name, but it looked like a weed that
most people would not bother about it. This plant has quickly spread
to locations at various altitudes with climatic differences, and
therefore each plant has evolved into a different variation that
superficially looked very different from the original plant. I also
recall that the diverged species could be crossbred, because there was
not enough time to make genetic divergence, but I did not see how the
hybrid species would look like.

Maybe the data I'm providing is not enough to give a hint to the
species I'm inquiring about, but I can give you an example from the
world of cacti, with which I'm much more familiar: Most cacti can be
grafted on other types of cacti, because they are closely related,
although they look quite different: The ribbed structure of ferocacti,
the radiating shape of Mamillarias, the star-shaped Ariocarpus, and
the columnar Quiabentia which still carries leaves. If we
crosspolinate two different cacti and obtain viable seeds, how would
the hybrid look like ? Is there an example of such a plant I would
find i the market ?