He also travelled extensively though the Pacific collecting samples and writing " Outline of Plant Geography ", published in 1926, about his travels.
22.
Physiological plant geography, perhaps more familiarly termed ecology, emerged from floristic biogeography in the late 19th century as environmental influences on plants received greater recognition.
23.
At the garden ( 1.5 ha ), he gathered an extensive collection of trees and shrubs, formed by the exposure of plant geography.
24.
He investigatd contemporary and historical plant geography of the Balkans and wrote papers on the vegetation of Pirin, Slavyanka, the Sofia Plain and the Danube islands.
25.
Warming wrote a number of textbooks on botany, plant geography and ecology, which were translated to several languages and were immensely influential at their time and later.
26.
In his spare time and during retirement he engaged in botanical pursuits, publishing over 300 works on topics such as plant geography, systematics and history of botany.
27.
His main work was concerned with the classification of flowering plants ( especially from the families Caryophyllaceae, Umbelliferae and Compositae ) and plant geography ( Siberia, Transcaucasia ).
28.
In the " Flora " he wrote about islands and their role in plant geography : the work made Hooker's reputation as a systemist and plant geographer.
29.
This resulted in a preliminary account entitled " " The Plant Geography of South Africa " ", in which he recognised 19 botanical regions, each with distinctive ecological characteristics.
30.
He was inspired by a plant geography tour of Switzerland organised by Swiss botanist Carl Schr�ter in 1908, which introduced him not only to vegetation types, but also to botanists from other countries.
