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Sandsten, E. P., and White, T. H., Md. Agric. Exp. Sta. Bull., 83 (1902). Austin, C. F., and White, T. H., Md. Agric. Exp. Sta. Bull., 93 (1904).
These plants have evolved unique structures—swollen stems, hollow thorns, or even bulbous roots—that act as living homes for entire ant colonies. Imagine the inside of a cactus or tree trunk ...