Abstract
Myriophyllum aquaticum and M. verticillatum are macrophyte herbs that can grow in dry shallow waters. These plants are resistant to variations in water levels. These plants can also grow at higher water levels and, in shallow wetland habitats, slow-flowing rivers, reservoirs or irrigation channels, lake edges, ponds, swamps. This study aims to analyze the differences in morphology and anatomy of two Myriophyllum species, as well as to determine the conditions of the plant community structure and the ecological conditions of the plants. The results showed that the comparison of M. aquaticum and M. verticillatum plants has different characteristics in the roots, stems, leaf stalks, leaf blades, and glands on the leaves. The paradermal part of the M. aquaticum leaf blade has an actinocyte stomata type, while M. verticillatum has a parasitic type. This study also found that M. aquaticum is more dominant than M. verticillatum. The diversity of M. aquaticum and M. verticillatum is classified as low, the evenness of M. aquaticum is classified as moderate while M. verticillatum is classified as low. Based on Simpson's Dominance Index, M. aquaticum and M. verticillatum showed that both were stable in the community.