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However flowering plants originated, we now know there are two main groups: monocots and dicots. A cotyledon is defined as a seed leaf, the first leaf that emerges as the seed germinates. Dicotyledonous plants (Class Magnoliopsida) are thought to be the most primitive flowering plants. They are defined by several characteristics.
Dicotyledon, or dicot, any member of the flowering plants that has a pair of leaves, or cotyledons, in the embryo of the seed. There are about 175,000 known species of dicots. Most common garden plants, shrubs and trees, and broad-leafed flowering plants such as magnolias and roses are dicots.
- The Editors of Encyclopaedia Britannica
May 3, 2017 · Class Magnoliopsida (dicots) Members of the Class Magnoliopsida are defined partly on the basis of the seed or seedling having two cotyledons, most obvious at germination. But the differences between dicots and monocots are many, and we will be able to recognize most flowering plants that we encounter as belonging to one or the other class ...
Dicotyledon. Magnoliatae Takht. [1] The dicotyledons, also known as dicots (or, more rarely, dicotyls ), [2] are one of the two groups into which all the flowering plants (angiosperms) were formerly divided. The name refers to one of the typical characteristics of the group: namely, that the seed has two embryonic leaves or cotyledons.
noun. ( plant taxonomy) A taxonomic class comprised of the dicotyledonous plants, according to the Takhtajan system and the Cronquist system of flowering plant classification. Supplement. The flowering plants (angiosperms) that make up the division Magnoliophyta may be grouped into two major plant groups: Dicotyledoneae (or Magnoliopsida) and ...
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Magnoliopsida. Magnoliopsida is a valid botanical name for a class of flowering plants. [1] 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. Magnolia flowers.
Class Magnoliopsida. Class Magnoliopsida (the Dicots) The diagram to the left represents one of the various systems that is used to classify the dicots (often referred to as the Cronquist system). It separates the dicots into 6 subclasses with supposed evolutionary relationships to each other illustrated by the "branching" patterns shown in the ...
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