ROSid

Rosids are a large clade of flowering plants (angiosperms) that represents one of the major lineages of the core eudicots. They are defined by molecular phylogenetic data and are divided into two primary subclades: Fabids (also called Fabidae) and Malvids (Malvidae). The rosids include a wide variety of plants, from herbaceous forms to tall trees, and comprise many economically important families such as Fabaceae (legumes), Rosaceae (roses and related fruits), Fagaceae (oaks and beeches), Brassicaceae (mustards), and Myrtaceae (myrtles).

Geographically, rosids are widespread and diverse, occurring in most habitats worldwide, with especially rich diversity in tropical and temperate regions. They contribute significantly to ecosystems and human economies through food crops (beans, apples, citrus, oilseeds), timber, ornamental species, and other products.

Evolution and systematics: The grouping is supported by extensive genetic data; origin is placed in the Early Cretaceous, with diversification continuing through the Cenozoic. Because ongoing research using new data and methods continues to refine relationships, the precise delimitation of orders and families within the rosids can change with new phylogenetic results.