3 Ancient Plants that Changed the Course of History

Learn why three ancient plants—hemp, eucalyptus and the opium poppy—are some of the most influential plants known to mankind.

The eucalypts are among the tallest broadleaved trees in the world, and the mountain ash (Eucalyptus regnans) of south Victoria and Tasmania is the tallest of them all.
Photo courtesy Quid Publishing (c) 2010