Hi John Why not send me some material ( even seed will do) to measure their nuclear DNA content of T sprengeri both the diploid and the supposed tetraploid? Ben J.M.Zonneveld Institute of Biology,Leiden University, Clusius lab Wassenaarse weg 64, 2333 AL Leiden, The Netherlands Zonneveld@rulbim.Leidenuniv.NL Fax: +31-71-5274999. min temp -10C (15F)