They're purely symbolic (6)

I believe the answer is:

lilies

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I'm afraid I can't explain this answer.

(Other definitions for lilies that I've seen before include "Flowering plants" , "bloomers" , "'''Consider the ... of the field, how they grow'' (Bible) (6)'" , "Flowers for when 'e is ill" , "Luke: ` `Behold the ...... of the field' '" .)

I've seen this clue in The Globe and Mail.

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