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* From: Jim Lockhart <jlockhar at cisco_com>
>Yes. Some have done this faster than you think. The evolution of Utricularia
>is very interesting. Vascular Aquatic Plants, a book I was wondering around
>at the AGA meeting in TN is a gem of a book(It's pretty old). You'd eat it
>up as would a number of folks here.
>I found some Callitriche in dark redwood stream that I just ID'ed in this
>book. Neat little plant but too fragile for trade. This one was true aquatic
>though. A reference in Aquatic Botany also has it(a plant in this genera) as
>the only proven case of submersed pollination.
I believe Didiplis Diandra can do this submersed pollination. I have seen
it happen a few times in tanks with no circulation. Diandra gets those tiny
little pink flowers, even (only ?) when it's submersed. Some time later,
tiny two leafed plantlets can be seen in close proximity to the plants. I
have never gotten them to grow into full sized plants, but Since I've seen
it happen a few times, I'm pretty convinced the plantlets are from the diandra.
I have had Didiplis reproduce, also. It definitely has underwater
pollination, and I have seen it produce small, reddish or pinkish floating
seeds. The seeds are enclosed in floating jackets that disintegrate in a
day or two, dropping the seeds to the bottom. I have had some of them grow
to full sized plants.
Ceratophyllum is also a species that has submersed pollination. I am
surprised that the reference in Aquatic Botany did not include
Ceratophyllum, since it is well known in the literature for its submersed
pollination. Another plant with submersed pollination is Zannichellia
palustris, Come to think of it, Najas species do this too.
Paul Krombholz in cool central Mississippi, where my ISP has acquired a new
name and lost the ability to even bill me for its services.