Elymus Caput-medusae, commonly known as the Medusa Head Grass, is a species of grass found in North America. It is a unique grass variety with long, twisted spikelets that resemble the head of the Gorgon Medusa from Greek mythology. However, there are several synonyms associated with this species, including Agropyron Caput-medusae, Hordeum Caput-medusae, and Hystrix Caput-medusae. These synonyms refer to the same type of grass but are different names that are commonly used in scientific literature. Elymus Caput-medusae is a fascinating plant species that is aesthetically pleasing and has significant ecological value, making it an essential component of many ecosystems in North America.