11. Phytogeography is often divided into two main branches : ecological phytogeography and historical phytogeography . 12. The term phytogeography itself suggests a broad meaning. 13. Von Humboldt advocated a quantitative approach to phytogeography that has characterized modern plant geography. 14. It is significant for its contributions to plant systematics, and to African floristics and phytogeography . 15. He was also interested in phytogeography . 16. In phytogeography , the Sonoran Desert is within the Sonoran Holarctic Kingdom of the northern Western Hemisphere. 17. He specializes in plant taxonomy, biosystematics and applications of techniques from molecular biology, phytogeography and phylogenetics. 18. He was the author of numerous works on descriptive botany, plant teratology, phytogeography and agricultural botany. 19. He was a leading authority of mosses, and also dealt with the systematics and phytogeography of flowering plants. 20. Afterwards he did biosystematic research on " Acer " in the Laboratory of botanical systematics and phytogeography .
