Dicotyledones

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Definition

Noun: A major class of flowering plants (angiosperms) characterized by seeds that contain two embryonic leaves (cotyledons). Plants in this class typically have leaves with a branching, net-like vein pattern, flower parts in multiples of four or five, and vascular bundles arranged in a ring within the stem. This group is contrasted with monocotyledons, which have a single cotyledon.

Examples of Usage
  • Noun:
    • The Dicotyledones include many familiar plants like roses, oaks, and sunflowers.
    • Botanists have traditionally divided angiosperms into the Dicotyledones and the Monocotyledones.
Advanced Usage
  • In botanical classification: While "Dicotyledones" (often capitalized) has been a traditional taxonomic rank (a class), modern phylogenetic studies show it is not a single, unified evolutionary group (it is paraphyletic). Many scientific texts now use the term "eudicots" or "dicots" (informally) for the largest clade within the former Dicotyledones.
    • The classic division into Dicotyledones and Monocotyledones is still useful for teaching basic plant morphology, despite its taxonomic revisions.
Variants and Related Words
  • Dicot (n., informal): A common abbreviated form for a dicotyledonous plant.
    • Beans are a typical dicot.
  • Dicotyledonous (adj.): Describing the characteristics of the Dicotyledones.
    • A dicotyledonous embryo has two seed leaves.
  • Eudicot (n.): A major monophyletic group that includes the vast majority of former "dicots," characterized by pollen with three furrows or pores.
    • The eudicots form a well-defined clade within the angiosperms.
Synonyms
  • Dicots (informal/non-taxonomic)
  • Broad-leaved plants (descriptive, but not all dicots have broad leaves)
Related Terms (Not Synonyms)
  • Monocotyledones / Monocots: The other major traditional class of angiosperms, with one cotyledon.
  • Angiosperm: The flowering plant division that includes both dicotyledons and monocotyledons.
  • Cotyledon: The embryonic leaf within the seed; the defining feature giving the class its name.
Noun
  1. comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae

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