1. He published works on mycology, plant geography , and systematics. 2. In 1863, he obtained his habilitation for specific botany and plant geography . 3. Von Humboldt advocated a quantitative approach to phytogeography that has characterized modern plant geography . 4. His publications were on general systematics, taxonomy, cytotaxonomy, and plant geography . 5. His main interests were plant geography and the flora of the Alps and the Balkans. 6. The book was based on Warming s lectures on plant geography at the University of Copenhagen. 7. Gross patterns of the distribution of plants became apparent early on in the study of plant geography . 8. The study of vegetation and plant geography arose out of new concerns that emerged with Humboldtian science. 9. Proceeding Forster, Karl Willdenow examined floristic plant geography , the distribution of plants and regionality as a whole. 10. He also did work in the areas of economic botany, plant geography , conservation, ecology, and floristics.