desert oak

noun2

1. •
   Various oaks found in desert regions.

   • Var. frutescens, Engelmann, is a shrub from three to ten feet high, known in the Sierra Nevadas as Desert Oak. — 1884
2. •
   (Australia) Any of several trees of dry parts of Australia, especially Acacia coriacea, Acacia sericophylla, and Allocasuarina decaisneana.

   • We passed through a stand of desert oaks, which are a species of casuarina and look less like an oak than a cactus. — 1987