annulära

Annularia is a genus of extinct plants belonging to the order Sphenophyllales. These plants are known from fossils found in Carboniferous and Permian rocks. Annularia is characterized by its whorls of leaves arranged around a central stem. The leaves are typically cuneate or spatulate in shape and are often united at their base.

The genus Annularia is important in paleobotany for understanding the diversity of ancient flora. Its fossils provide insights into the plant life that existed millions of years ago, contributing to our knowledge of prehistoric ecosystems and the evolution of plant forms. The arrangement of leaves in whorls is a distinctive feature that helps in its identification from fossil records.

Fossils of Annularia are often found in association with other Carboniferous and Permian plant groups, indicating the ecological conditions under which they thrived. These plants likely grew in moist environments, such as riverbanks and swamps. The study of Annularia contributes to reconstructing the paleogeography and paleoenvironment of these ancient periods. Its distinctive morphology makes it a valuable marker fossil in certain geological strata.