Who proposed the first natural system of classification?

George Bentham and Joseph Dalton Hooker gave natural system of classification which was based on ultra structure anatomy embryology and phytochemistry

Bentham and hooker classified the plant kingdom into 2 division into cryptogamia (non flowering plants) and phanerogamia(flowering plants) Phanerogamia further divided into dicotyledonae ,gymnospermae, and monocotyledonae , I this natural system all characters are considered and plants are arranged according to various levels of their classification.