Hello,
I am not sure what trees are representing plywood...but the trees and/or leaves may be reillustrated in the styles shown to substitute for what is more accurate.
#46 & #53 are cedar trees;
#50 & #52 are oak leaves
#47 & 48 are a generic leaf
and #51 is a stylized 'w' with layers as on the plywood
Kind Regards
Tere