Guaiacum images - Joel Sartore

The endangered Roughbark Lignum-vitae (Guaiacum officinale), at the U.S. Botanic Garden Production Facility in Washington, DC.

The endangered Roughbark Lignum-vitae (Guaiacum officinale), at the U.S. Botanic Garden Production Facility in Washington, DC.

The endangered Roughbark Lignum-vitae (Guaiacum officinale), at the U.S. Botanic Garden Production Facility in Washington, DC.

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National Geographic Photographer and Speaker