While I have not seen an actual report of a chromosome count, it is widely
reported that 'Thompson Seedless', the best-known, historically most important
seedless grape in the US, and from which a major percentage of the fresh grape
market, virtually all raisins, and virtually all processed grapes are produced
in this country, is triploid. Is it the odd exception to stenospermocarpy, or
are such reports in error, I wonder?