Selaginella lepidophylla

Selaginella lepidophylla (syn. Lycopodium lepidophyllum) is a species of desert plant in the spikemoss family (Selaginellaceae). S. lepidophylla is noted for its ability to survive almost complete desiccation; during dry weather in its native habitat, its stems curl into a tight ball and uncurl only when exposed to moisture. The outer stems of Selaginella lepidophylla bend into circular rings in a relatively short period of desiccation, whereas inner stems curl slowly into spirals due to the hydro-actuated strain gradient along their length. It is native to the Chihuahuan Desert.