Located on the southern part of the Wabash River, near the town of Lagro, Hanging Rock is exactly what its name suggests: a ...

The cactus grew on a low limestone outcrop surrounded by mangroves near the shore that originally had a distinct layer of soil and organic matter that allowed the cactus and other plants to grow.

Discovered in 1992, this solitary stand of Key Largo tree cactuses sprouted from a limestone outcrop bordered by mangroves on Key Largo, a 33-mile-long island south of Miami popular with tourists.

Around 150 individuals existed in 2011 on a tidal rock barren atop a small limestone outcrop among a plethora of mangroves in John Pennekamp Coral Reef State Park. But by 2015, researchers ...