He is most famous for his synthesis of European plant geography, and his mountains origins theories.

He published works on mycology, plant geography, and systematics.

He took a particular interest in the history of plant geography.

He called for more intensive effort on the part of the scientific community to make use of such local knowledge in determining plant geography.

In 1863, he had been promoted to professor for specific botany and plant geography.

Much research effort in plant geography has since then been devoted to understanding this pattern and describing it in more detail.

Research in plant geography has also been directed to understanding the patterns of adaptation of species to the environment.

His areas of expertise included plant geography and systematics.

In Britain there was a tradition of plant geography supported by amateur activity.

He is known best for his research in the field of plant geography, that included mapping of the world's different floristic zones.