The Collaborative International Dictionary of English v.0.48:

Plane tree \Plane" tree`\ (Bot.)
   Same as 1st Plane.
   [1913 Webster] Planet-stricken

WordNet (r) 3.0 (2006):

plane tree
    n 1: any of several trees of the genus Platanus having thin pale
         bark that scales off in small plates and lobed leaves and
         ball-shaped heads of fruits [syn: plane tree, sycamore,
         platan]