Principles of plant classification
Start with the big picture
The species is the basic taxonomic unit, while related species are grouped into genera and then into broader ranks. Binomial nomenclature assigns each plant a two-part name: an italicized, capitalized genus followed by an italicized, lowercase species epithet; the author citation is not italicized. The International Code of Nomenclature (ICN) guides naming through principles such as priority, typification, and stability. Classification may rely on a few visible traits, multiple characters, or phylogenetic evidence that includes molecular data. Morphology, anatomy, chemistry, and other evidence contribute to taxonomic decisions. In pharmacognosy, these concepts support reliable plant identification and help reduce the risk of crude-drug adulteration or substitution.
What you'll learn
- Arrange the main taxonomic ranks from kingdom to species.
- Apply the basic formatting conventions of binomial plant names.
- Describe how the ICN and type specimens support consistent naming.
- Distinguish artificial, natural, and phylogenetic classification approaches.
- Identify evidence sources and tools used in plant taxonomy.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
