Photograph by Charles Allmon. From “Martinique: A Tropical Bit of France,” National Geographic, February, 1959. Towering Tree Ferns Spread a Lacy Canopy Above a Martinique Hillside. These 20-foot relatives of plant ferns abound in tropical rain forests. The author [Gwen Drayton Allmon] inspects a stand near the village of Deux Choux (Two Cabbages).