According to Mabberley (2002) there are six species total in this genus.

Bpjea (usun 'x' - z powodu spamu) schreef
Thanks a lot
Anyway it's more than I thought. Could You just tell me if that genus is
only native to America (South and Central)?

+ + +
Yes, only the Neotropics. Puerto Rico has a species and so does the Amazon
+ + +

I've got a picture of one Crescentia species and it seems it will be much
harder to identify it. It seems to me, because You could be more lucky in
giving a right name of it. I'll publish the picture and I'll tell You the
URL to it. I have a few more pictures (of some other species) from Peru, and
I have no idea what they're showing.

+ + +
That might be a nice idea, although I am not really very good at identifying
plants. But Mel seems to be, and perhaps somebody else will pitch in.
PvR