any plant that is adapted to grow well in the dry savannah
2.
any of various extinct primitive plants of the Upper Silurian and Devonian periods, lacking true roots and leaves but having a creeping rhizome and a cylindrical branching stem with a central vascular strand
psilophyte in American English
(ˈsaɪləˌfaɪt)
noun
any of various extinct, early land plants of the Silurian and Devonian periods, characterizedby a simple vascular structure and lacking true roots and leaves