ARNICA

Set to 3 different clues across 3 published puzzles, most often “Yellow-flowered perennial” — The New York Times, Sunday, 11 April 2010.

6 letters

Every clue on record, most used first

Yellow-flowered perennialonce
The New York Times — Sunday, 11 April 2010
Flower tincture once used as a salveonce
The New York Times — Thursday, 27 June 2002
Yellow-flowered herbonce
The New York Times — Saturday, 18 January 1997