Filed from 4 published puzzles

FERNS

Set to 3 different clues across 4 published puzzles, most often “Flowerless plants” — The New York Times, Sunday, 21 October 2001.

5 letters

Every clue on record, most used first

Flowerless plants2 times
The New York Times — Sunday, 21 October 2001
Seedless plantsonce
The New York Times — Monday, 3 July 1995
Plants with frondsonce
The New York Times — Monday, 3 April 1995