Tristar plant?

[Finn N. Rasmussen]

Taxacomers:

In David Attenborough's TV-production "the private life of plants"
is shown a fruit with six wings that fly like a helicopter (or
rather, like an autogyro). The wings are arranged very much like the
propellers of a ship, although the individual blades are not
twisted. Sir David refers to it as the "Tristar tree" . It is not
mentioned int the book that accompanies the series, so it can't just
be looked up.

Does anybody know the Tristar tree?

Thank you in advance,   FinnR

                      Finn N. Rasmussen
                      Botanical Laboratory, University of Copenhagen
                      Gothersgade 140, DK-1123 Copenhagen K., Denmark
                      Phone: +45 35 32 21 55   Fax: +45 33 13 91 04
                      Web homepage: http://www.bot.ku.dk
                      Email: FinnR at bot.ku.dk