A cytological study of 25 individuals from differentDroserapopulations shows that the chromosome number of the four taxa occurring in Québec confirms the results already published for these species and does not vary.Drosera rotundifoliaL.,D. intermediaHayne andD. linearisGoldie possess 2n = 20 chromosomes, whileD. anglicaHuds. has 2n = 40. Three different hybrids however were detected:D. rotundifoliaxD. linearis(2n = 20),D. linearisxD. anglica(2n = 30) andD. rotundifoliaxD. anglica(2n = 30). The occurrence of the latter hybrid, well known in Europe and Japan (D. xobovataMert. & Koch), is cytologically confirmed for the first time in eastern North America. The nameD.xlinglicaKusakabe ex Gauthier & Gervais is suggested for thelinearis- anglicahybrid, whileD.xwoodiiGauthier & Gervais is proposed for thelinearis- rotundifoliaprogeny. The existence of spontaneous crosses involving D.rotundifolia, D. anglicaandD. linearisis consistent with the hypothesis thatD. anglicais an amphiploid resulting from the chromosome doubling of the sterilelinearisxrotundifoliahybrid. The meiotic pairing configurations observed in alinearisxanglica(2n = 30) hybrid suggest however that the process must have taken place with a primitiveD. linearissomewhat different from the present species.D. linearisis a species with narrow ecological requirements whose northeastern American lineage with some isolated western populations alone subsist and need protection.