Taxonomic revision of genus Lemna L. (Lemnaceae Gray) in Egypt

This study was conducted to revise the taxonomic identity and clarify specific relationships within genus Lemna in Egypt. The studied species included: L. aequinoctialis Welw., L. gibba L., L. minor L., and L. trisulca L. The latter one was recorded as a new record to the flora of Egypt. Based on morphological traits, the numerical analysis showed a considerable degree of similarity among the studied species. It divided the Lemna species into three clusters. Cluster one included L. gibba and L. minor. Clusters two and three included: L. aequinoctialis and L. trisulca, respectively. Based on the degree of similarity, L. gibba and L. minor have the highest degree of similarity value 0.500 (50%), while the lowest one 0.174 (17.4%) was recorded between L. gibba and L. trisulca. This work proved the morphological similarity and dissimilarity among the studied species and added a new record to flora of Egypt.