Van Gogh work that in 1987 became the most expensive painting ever sold (6)

I believe the answer is:

irises

(Other definitions for irises that I've seen before include "Coloured membranes in eyes, or showy flowers" , "blooms" , "Plants with sword-shaped leaves" , "Eye membranes or showy flowers." , "Subject for van Gogh" .)

I've seen this clue in The New York Times.

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