rescue grass
/ˈrɛskjuː ˌɡrɑːs/ /ˈrɛskjuː ˌɡras/Chiefly North American
noun
A drought-resistant South American species of brome grass, Bromus catharticus, grown as a forage grass on dry soils or in dry climates, especially in the southern United States.
Origin
Mid 19th century. From rescue + grass, so called on account of its hardy character.