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Eudicots, also known as rosids, are a major group of flowering plants, belonging to the clade Eudicots. This group is characterized by their two cotyledons, or seed leaves, which are a defining feature of the clade. Eudicots are further divided into two major clades: core eudicots and basal eudicots. Core eudicots include familiar plants like roses, sunflowers, and oak trees, while basal eudicots include plants like magnolias and water lilies.

The eudicot clade is one of the two major lineages of flowering plants, the other being the monocots. Eudicots are distinguished from monocots by their floral parts, which are typically in multiples of four or five, and their vascular bundles, which are typically scattered throughout the stem. Eudicots also have a more complex root system, with a taproot or a fibrous root system, compared to the monocots, which typically have adventitious roots.

Eudicots are a diverse group, with over 180,000 known species, making up about 75% of all flowering plants. They are found in a wide range of habitats, from tropical rainforests to deserts, and from sea level to high mountain peaks. Eudicots play a crucial role in many ecosystems, providing food, medicine, and materials for human use, as well as supporting biodiversity.

The study of eudicots is an active area of research, with scientists working to understand their evolution, diversity, and ecological roles. Advances in molecular biology and genomics are providing new insights into the relationships between different eudicot groups, as well as their interactions with other organisms in their environments.