rosidae
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Definition
Noun: - A subclass of dicotyledonous plants: Rosidae is a taxonomic subclass within the class Magnoliopsida (dicots). It is a large group characterized primarily by plants that typically have flowers with numerous, separate petals (polypetalous). This group encompasses many familiar families of trees, shrubs, and herbs.
Usage
- The term is used in scientific botanical classification to categorize a major lineage of flowering plants.
- It is primarily found in academic, taxonomic, and horticultural contexts.
Examples
Advanced Usage
- In modern phylogenetic systems (like the APG system), the traditional group "Rosidae" is often redefined as part of the larger clade "rosids," which is a more precise evolutionary grouping based on genetic data. However, the term remains valid in certain taxonomic frameworks.
Variants and Related Words
- Rosid (noun): In modern cladistics, a member of the large monophyletic clade "rosids," which includes the core of the traditional Rosidae and other related plants.
- Polypetalous (adjective): Having petals that are separate and not fused together, a characteristic feature of many plants within the Rosidae.
Synonyms
- Rosid clade (in a modern phylogenetic context).
- Polypetalous dicots (descriptive term based on flower structure).
Related Terms (Conceptual Groupings)
- Asteridae: Another major subclass of dicotyledonous plants, often contrasted with Rosidae, typically characterized by flowers with fused petals (sympetalous).
- Magnoliopsida: The class of dicotyledonous plants to which the subclass Rosidae belongs.
- The names of member families (e.g., Rosaceae, Euphorbiaceae, Myrtaceae) are directly related as they are constituent parts of the group.
Noun
- a group of trees and shrubs and herbs mostly with polypetalous flowers; contains 108 families including Rosaceae; Crassulaceae; Myrtaceae; Melastomaceae; Euphorbiaceae; Umbelliferae