leaf_type=* describes the type of leaves, for instance broadleaved, or needleleaved.
This key is used as refinement for woody vegetation, such as woodlands, trees or shrubs.
How to map
Draw an area 
around the grounds of the the woodland or place a node 
at the centre of the grounds.
Add one of the following objects:
This tag does not apply on boundary=forest or boundary=forest_compartment entities, only on underlying natural=wood/landuse=forest entities.
These values relate to the Land Cover Classification System (LCCS) by FAO. The Global Forest Map (GFM) by UNEP-WCMC and the Global Land Cover 2000 Project by EU use the same terminology.
Palm trees
"Palm trees" are trees of the family 
Arecaceae. There is no community consensus on how to tag these trees, although several different tags are in use. Most of these tags are technically incorrect, because palm is not the scientific name of these trees and palm trees are a family rather than a genus or species. See Talk:Tags for Palm trees.
The most widely used tag for tagging palm trees is taxon:family=Arecaceae. Despite the fact that this was largely introduced in February 2021 through an automated edit, many mappers agree that it is the most suitable tag for identifying palm trees. leaf_type=palm is also widely in use, but is botanically incorrect as palms have broad leaves.
Rendering
See also
Possible tagging mistakes
wood=*‒ This tag has been deprecated.