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[Martha Davis <martha_davis@earthlink.net>]

Will apricot and sand cherry (Prunus pumila) naturally form a plumcot hybrid?

It depends a bit on what you mean by naturally.  There was some work done at Rutgers on plum apricot hybrids. While P. salacina is most common for that sort of thing they tried a variety of other plum species.  There is some info on the Taxa held by Davis, 

http://www.ars-grin.gov/cgi-bin/npgs/html/site_holding.pl?DAV 

under the prunus hybrids NJPC numbers are various New Jersey Plumcots that have been sent to the repository.  If you click on the individuaI numbers usually there is some breeding info.  I suspect that the most promising ones are not there since they are releasing or still working with them.

Martha