Crossword Genius

Tree that's a source of salicylic acid, a precursor to aspirin (6)

Ross

I believe the answer is:

willow

(Other definitions for willow that I've seen before include "See 22" , "Common riverside tree" , "Quick-growing tree with flexible branches" , "Fast-growing tree" , "One [TYPE OF TREE]" .)

I've seen this clue in The New York Times.
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