Painting by van Gogh during his time in an asylum (6)

I believe the answer is:

irises

(Other definitions for irises that I've seen before include "Coloured membranes in eyes, or showy flowers" , "Flowers and parts of eyes" , "Eye membranes or showy flowers." , "Subject for van Gogh" , "blooms" .)

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

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