Flax (. Linum usitatissimum L) is an important oil seed crop with multiple applications in human food, industrial processes and animal feed. Flax improvement requires information on genetic diversity of different traits. In the present study morphological characteristics of 81 flax accessions were studied in the filed using a lattice square design with two replication. Results showed a significant variation among the accessions for the measured characteristics. Seed yield per plant ranged from 0.22 to 1.87 gr and together with number of capsule per plant showed a high coefficient of phenotypic and genetic variation. Heritability was high for most of the measured characteristics and ranged from 51.12 to 88.45 percent for seed yield per plant and plant high respectively. Phenotypic correlation coefficient showed that number of capsule number per plant had a positive significant correlation with seed yield per plant and 1000-seed weight. Principle component analysis revealed that the first five components explained 80.53% of the variation. Biplot results showed that selection based on higher values of first component (yield component) and lower values of second component (field characters) will result in genotypes with higher seed yield. Cluster analysis divided genotypes into five groups. Genotypes in group two had the highest1000-seed weight while genotypes in group three had higher seed yield. Keywords: Linseed, Heritability, yield component
