Turk's-cap lily
noun
variants:
or less commonly Turk's cap
Definition of Turk's-cap lily
: either of two lilies having nodding flowers with strongly revolute perianth segments:
a
: a widely cultivated lily (Lilium martagon) with rather small dull purple flowers
b
: an American native lily (Lilium superbum) with flowers resembling those of the tiger lily