What is Taxonomy and Magnoliopsida?
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Taxonomy classes are used to classify organisms based on their characteristics. The classes are then placed on a phylogenetic tree directly beneath a phylum (animal) or division (plant). One such class is the Magnoliopsida class; a class of flowering plants.
Magnoliopsida is the botanical name for a class of flowering plants. This class, by definition, includes the family of Magnoliaceae, yet it will vary, being more inclusive or less inclusive depending on the system of classification that is being used. |
Magnoliopsida Class in Different Systems
Cronquist & Takhtajan System
In both the Cronquist system and the Takhtajan system, the name Magnoliopsida was used for a group known as Dicotyledons.
The Cronquist system, developed by Arthur Cronquist, classifies flowering plants into two classes: Magnoliopsida (dicotyledons) and Liliopsida (monocotyledons). These classes are then grouped into subclasses. Examples of these subclasses are: Magnoliidae, Caryophylliae, Dilleniidae, Asteridae, Rosidae, and Hamamelidae. The Takhtajan is a system of plant taxonomy. Published by Armen Takhtajan, multiple versions from the 1950s have been created. This system is often compared to the Cronquist system. The Takhtajan system is composed of classes, subclasses, super orders, orders, and families. |
Dahlgren & Thorne Systems
The Dahlgren system and the Thorne system (1992) had used the name Magnoliopsida for angiosperms (flowering plants). This system uses the class Magnoliopsida and contains the subclasses Magnoliidae and Liliidae.
The Dahlgren system was created by Rolf Dahlgren and later overseen by his wife Gertrud Dahlgren who continued his system of classification after his death. As one of the modern systems of plant taxonomy, this system's classifications is used by other systems as well. The Reveal system provides an extensive listing of Dahlgren's classification. The Thorne system (1992) was created by botanist Robert F. Thorne. This system, however, was replaced in 2000 with a new system. Earlier versions of this system used the suffix -florae for superorders. The Thorne System of 1992 counted a total of 440 families and 69 orders. |
Reveal System
The Reveal system uses the name Magnoliopsida for a group of primitive dicotyledons. This group corresponds to roughly half of the plants in the magnoliids. The class contains superorders within such as: Magnolianae and Lauranae.
This system was created in the 20th-century as a system of plant classification by botanist J.L. Reveal. This system is continuously updated with the last update of the system being made in 1999. Later, this system joined the Angiosperm Phylogeny Group and contributed to the APG II system. |
APG SystemsThe APG (Angiosperm Phylogeny Group), APG II (Angiosperm Phylogeny Group) and APG III (Angiosperm Phylogeny Group) systems classify differently from other systems. These botanical names are used only at the rank of order and below. For the ranks above, the systems use their own names such as angiosperms, eudicots, monocots, and more. These names are unranked. Magnoliopsida is also a class that is not defined. As the idea that dicotyledons could be a taxonomic unit, the name was rejected by the APG.
The first APG system, published in 1998, is an obsolete version of a modern system of plant taxonomy that was published in 1998 by the Angiosperm Phylogeny Group. Later in 2003, the APG system was revised and recreated into the APG II system. This system lasted six years before it was once again recreated in 2009 by a further revision--the APG III system. |