Holly genus (4)
I believe the answer is:
ilex
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">holly genus</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ilex that I've seen before include "The holm-oak" , "common holly" , "Genus of trees that includes hollies" , "The holly family of trees" , "Holly, perhaps" .)