Chromosome numbers and meiosis in 164 interspecific hybrids representing 17 combinations ofS. officinarum(2n=80) xS. spontaneum(2n= 54, 56, 61, 63, 64 80, 112, 124 and 128) are reported. Hybrids involvingS. spontaneum2n= 61, 63 and 124 as the pollen parents are reported for the first time.