Primary trisomics ofTrigonella corniculatawere isolated from spontaneous autotriploids. They differed from the diploids, as well as from one another, in morphological characteristics. Individual trisomics were confirmed from a study of their somatic chromosomes. They were designated on the basis of the most conspicuous morphological features as ‘Purple midrib’, ‘Thick leaf’, ‘Deep curvature’, ‘Condensed’ ‘Notched’, ‘Tiny’, ‘Dark green’ and ‘Pseudonormal’ which had respectively from the first to the eight chromosome extra to the normal somatic complement in the order of decreasing length. One of the autotriploids was picked out from an irradiated population and, therefore, the morphological variation observed in the trisomics is the result of both trisomy and heterozygosity.