One of the mysteries of the English language finally explained.
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.
Mid 19th century. From rescue + grass, so called on account of its hardy character.
rescue grass/ˈrɛskjuː ˌɡrɑːs//ˈrɛskjuː ˌɡras/
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