Global botanical geography. 19th-century botanical maps and illustrations depicting the distribution and variation in plant types and habitats worldwide. Across top are the variations on mountains at different latitudes: the Andes, Tenerife, the Himalayas, the Alps and Pyrenees, and Lapland (see C026/8519). The main world map is colour-coded for 25 different regions (key at left). A graph of statistics of plant families is at right. This work, by Scottish geographer Alexander Keith Johnston (1804-1871), was based on work by German geographers Alexander von Humboldt and Heinrich Berghaus. It was published in 'The Physical Atlas' (1848).