plane

The plane tree is very tolerant of pollution and is widely grown in towns. It has flaky bark and burrlike fruit resembling drumsticks.

In botany, any of several trees belonging to the plane family. Species include the oriental plane (P. orientalis), a favourite plantation tree of the Greeks and Romans, and the American plane or buttonwood (P. occidentalis). A hybrid of these two is the London plane (P. x acerifolia), with palmate, usually five-lobed leaves, which is widely planted in cities for its resistance to air pollution. (Genus Platanus, family Platanaceae.)

All species have hanging burlike fruits and can grow to 30 m/100 ft high.

plane

Flat surface. Planes are either parallel or they intersect in a straight line. Vertical planes, for example the join between two walls, intersect in a vertical line. Horizontal planes do not intersect since they are all parallel.