Augustin Pyramus de Candolle wrote “Théorie élémentaire de la botanique” (Elementary Theory of Botany) in 1813.

In this book, he discussed plant classification, morphology, and taxonomy principles.

Other options:

• Takhtajan – 20th-century botanist, proposed modern classification systems.

• Eichler – developed a phylogenetic system of plant classification.

• Linnaeus – wrote Systema Naturae and Species Plantarum, not this book.

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