flora : Idioms & Phrases
Desert flora
(Bot.) , the assemblage of plants growing naturally in a desert, or in a dry and apparently unproductive place.
Webster 1913
intestinal flora
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noun harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning
WordNet
probiotic flora
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noun a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant
probiotic microflora; probiotic bacterium; probiotic.