Painting by Vincent van Gogh that became the most expensive painting ever sold in 1987 (6)

I believe the answer is:

irises

(Other definitions for irises that I've seen before include "Is sire in favour of flowers?" , "Flowers and parts of eyes" , "Flags" , "Plants with sword-shaped leaves" , "Parts of eyes or flowering plants" .)

I've seen this clue in The Independent.

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