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NATURAL SYSTEM OF PLANT CLASSIFICATION ACCORDING TO CHARLES BESSEY BY: ASHLEY BECK

NATURAL SYSTEM OF PLANT CLASSIFICATION ACCORDING TO CHARLES BESSEY BY: ASHLEY BECK. WHAT IS THE NATURAL SYSTEM?. A phylogenetic system of organizing flowering plants with the use of genetic techniques. Besse’s theory was based off of evolution. THE NATURAL SYSTEM.

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NATURAL SYSTEM OF PLANT CLASSIFICATION ACCORDING TO CHARLES BESSEY BY: ASHLEY BECK

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  1. NATURAL SYSTEM OF PLANT CLASSIFICATIONACCORDING TO CHARLES BESSEYBY: ASHLEY BECK

  2. WHAT IS THE NATURAL SYSTEM? • A phylogenetic system of organizing flowering plants with the use of genetic techniques. • Besse’s theory was based off of evolution.

  3. THE NATURAL SYSTEM • “Besse’s cactus” was based on his 28 rules, which show the evolutionary trends in angiosperm. • The most direct path represents the actual evolutionary history of a given group.

  4. THE NATURAL SYSTEM • The most primitive, original flower was believed to have had many separate petals, stamens, and carpels. • As they evolved the parts of the flowers either fused together, reduced, or became absent. • The simple structures are not primitive, but have become simple as a result of a reduction from more complex parts.

  5. THE NATURAL SYSTEM • An example of the primitive flower would be the Ranunculus, buttercup flowers.

  6. THE NATURAL SYSTEM • A more advanced type of flowering plant would be the catkin inflorescences.

  7. Natural System of Plant Classification By: Thursday lab Charles Bessey 1845-1915

  8. Bessey • Published Work: The Phylogenetic Taxonomy of Flowering Plants

  9. Charles Bessey • He developed a set of rules or “dicta” stating which characteristics were primitive an which were advanced in flowering plants.

  10. Natural System • A natural system is one which reflects the evolutionary relationships of the organisms. In this type of classification, all the members of a category (family, order, etc.) are known or presumed to be monophyletic, meaning they share a common ancestor.

  11. Those who started the Natural System were observing overall resemblances amongst plants, then making evolutionary connections. Similar to differences amongst the five kingdoms.

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