subclass rosidae
Noun: - A taxonomic subclass of flowering plants: In botanical classification, 'subclass Rosidae' refers to a major group of dicotyledonous plants (dicots). It is characterized primarily by plants that typically have flowers with numerous, separate petals (polypetalous). This subclass historically encompassed a very large and diverse collection of plant families, including many economically and ecologically important ones.
- This term is used in the scientific field of plant taxonomy (the science of naming, defining, and classifying plants). It represents a specific rank (subclass) within the hierarchical biological classification system.
- The composition and definition of 'Rosidae' have been revised significantly with the advent of molecular phylogenetic studies. In modern classification systems (like the APG system), the groups once placed in Rosidae are now distributed among several clades, primarily the rosids. Therefore, 'subclass Rosidae' is largely a historical or traditional taxonomic term.
- Scientific Context:
- The subclass Rosidae contains many familiar fruit-bearing plants like apples and roses.
- Botanists studied the evolutionary relationships within the subclass Rosidae.
- Phylogenetic Context: In contemporary botany, one might refer to the rosid clade or rosids, which is a monophyletic group (a group consisting of an ancestor and all its descendants) identified by genetic analysis. The traditional 'subclass Rosidae' is an approximation of this clade but is not identical in its membership.
- The core of the traditional Rosidae corresponds to the modern rosid clade.
- Rosid (noun/adjective): Pertaining to the modern clade of flowering plants (rosids) that includes the core groups of the former subclass Rosidae.
- The rosid clade is one of the largest groups of flowering plants.
- Rosaceous (adjective): Of or relating to the rose family (Rosaceae), which is a prominent family within the Rosidae/rosids.
- Rosids (in modern phylogenetic contexts): This is the preferred term for the evolutionary group.
- Polypetalous dicots (descriptive, not a formal name): A descriptive phrase referencing a key morphological characteristic of many plants in this group.
- There are no common idiomatic or non-scientific meanings for this specific term. It is exclusively a scientific taxonomic term.
The provided reference definition accurately lists key characteristics: it is a group of trees, shrubs, and herbs with mostly polypetalous flowers, containing many families such as Rosaceae (rose family), Crassulaceae (stonecrop family), Myrtaceae (myrtle family), Melastomaceae (now usually Melastomataceae), Euphorbiaceae (spurge family), and Umbelliferae (now usually Apiaceae, the carrot/parsley family). This reflects the traditional, broad circumscription of the subclass.
-
a group of trees and shrubs and herbs mostly with polypetalous flowers; contains 108 families including Rosaceae; Crassulaceae; Myrtaceae; Melastomaceae; Euphorbiaceae; Umbelliferae
Khám phá thêm
Các từ liên quan
Từ đồng nghĩa
Từ gần giống
