Palo Verde means “green tree” or “green pole” in Spanish. The bark of a Palo Verde is green because it is filled with chlorophyll. This tree conducts a majority of its photosynthesis in the bark and some in the leaves. This is the Foothill or Yellow Palo Verde in the Arizona Transition Zone area.
NOTES-IN-NATURE.ORG 
Incredible! Does the palo verde bother with leaves? Or does it do ALL it’s photosynthesis through it’s bark?
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My understanding is a little with the leaves, as well.
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