Plants that have the ability to store up water to help them survive occasional or even frequent long droughts. We're all familiar with the cacti and how it stores its water inside. Some other plants tend to roll up their leaves very tightly in an effort to save their water. Some plants tend to have very slick and shiny leaves that act like a coat of varnish. And of course, other plants actually let their leaves fall off in an effort to stop/slow down transpiration.
"Xerophyte. X-E-R-O-P-H-Y-T-E. Xerophyte!"