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Magnoliopsida is a valid botanical name for a class of flowering plants. By definition the class will include the family Magnoliaceae, but its circumscription can otherwise vary, being more inclusive or less inclusive depending upon the classification system being discussed. A Bangladesh Journal of Plant Taxonomy called “Preliminary Taxonomic Study on Homestead Flora of Four Districts of Bangladesh: Magnoliopsida” describes the Magnoliopsida species as a class of flowering plants also known as Dicotyledons which comprises 455 species under 302 genera belonging to 78 families. Dicotyledons are the most dominant and successful plant group as they compromise of about 62.5% of the total angiosperm species (Roy 2020) (Thorne 2007).

Magnolia flowers

Cronquist and Takhtajan systems[edit]

In the Takhtajan system and the Cronquist system the name assd for the group known as dicotyledons.

Magnoliopsida in the Takhtajan system[edit]

The Takhtajan system used this internal taxonomy:

Magnoliopsida in the Cronquist system[edit]

The Cronquist system used this internal taxonomy (in the 1981 version):

Dahlgren and Thorne systems[edit]

  • class Magnoliopsida [= angiosperms]
    subclass Magnoliidae [= dicotyledons]
    subclass Liliidae [= monocotyledons]

Reveal system[edit]

The Reveal system used the name Magnoliopsida for a group of the primitive dicotyledons, corresponding to about half of the plants in the magnoliids:

APG systems[edit]

In the APG and APG II systems botanical names are used only at the rank of order and below. Above the rank of order, these systems use their own names, such as angiosperms, eudicots, monocots, rosids, etc. These names refer to clades (unranked). This class Magnoliopsida is not defined. The idea that dicotyledons could be a taxonomic unit and get a formal name is rejected by the APG: the dicots are considered to be paraphyletic.