A tree model with leaves looks like (created by sapling addon):
Using unwrap and reset shows orientation issues like a leaves stem pointing to the outside instead of the branch.
Before UV reset the UV-map shows this pattern, some leave pairs are upright and some are rotated by 90°.
How should all the UV islands be rotated to match the images orientation? Is there a method that is less time consuming than manual select and transform?
I tried almost all options from Mesh / Select / Similar to unwrap at least the upright and rotated pairs of faces separately.