The Plant Encyclopedia - File:World Plant Hardiness Zone Map.jpg. Topics. Botany Online: The Internet Hypertextbook. Botany online: The History of a Science. Botany online 1996-2004.
No further update, only historical document of botanical science! The very first ancient documents about plants (Babylonian souces, the Old Testament, HOMER's works) that came down on us regarded plants mainly under the aspects of utility and medicinal use. Tracheophyta. Natural History: First Tracheophytes appear in the fossil record by 408 MYA.
The vascular system allows plants to grow much larger and taller than those without. Over time competition leads to the refinement of the vascular system. Sometime between 390MYA and 354MYA wood, true leaves and advanced rooting systems were all developed. At that time some vascular plants became able to grow to 35 meters tall.