Cuckoo pint, for example (4)

I believe the answer is:

arum

(Other definitions for arum that I've seen before include "Plant of the family Araceae, eg lords-and-ladies" , "Plant with small flowers and arrow-shaped leaves - kind of lily" , "Eg, cuckoo pint" , "Type of 1 Across" , "A sort of lily." .)

I've seen this clue in The Guardian.

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