Botanist's study (5)

I believe the answer is:

flora

(Other definitions for flora that I've seen before include "__ MacDonald, heroine of the 1745 Jacobite rising" , "The plants of an area (5)" , "A region's plants" , "growth" , "Plants of a particular region" .)

I've seen this clue in the New York Times, the L.A. Times Daily, the Newsday.com, The Washington Post, the Wall Street Journal and the Penny Press.

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