Flowerless foliage (5)

I believe the answer is:

ferns

(Other definitions for ferns that I've seen before include "Frondy plants" , "Flowerless plants with feathery or leafy fronds" , "Plant, maidenhair or tree say" , "Flowerless plants with feathery green leaves" , "Ancient plants" .)

I've seen this clue in The Wall Street Journal.

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