The American holly tree requires a "male" tree and a "female" tree to produce red berries in the winter, which indicates that the male flowers lack and the female flowers lack .

Name: The American holly tree requires a "male" tree and a "female" tree to produce red berries in the winter, which indicates that the male flowers lack and the female flowers lack .
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In holly trees, male flowers lack carpels (female reproductive parts), and female flowers lack stamens (male reproductive parts).

The American Holly Tree Requires a "Male" Tree and a "Female