Definition of barometer bush
: a compact evergreen shrub (Leucophyllum frutescens of the family Scrophulariaceae) native to Texas and adjacent northern Mexico that has grayish-green hairy leaves and solitary, bell-shaped, usually pink or purple flowers
Hope bloomed on those hardy plants, known to old-timers as barometer bushes because showers trigger their flowers.— Tracy Hobson Lehmann, San Antonio Express-News, 9 July 2011
— called also cenizo, Texas sage
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Merriam-Webster unabridged
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Time Traveler for barometer bush
The first known use of barometer bush was in 1957
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