Aristolochia chilensis, known locally as orejas de zorro (fox ears), is a herbaceous perennial plant native to Chile.

[2][3] The flowers may be yellowish or brownish-purple in color, and emit an unpleasant odor that attracts the flies which pollinate it.

Retorse (downward-pointing) hairs on the flower, similar to those of pitcher plants, impede the departure of the flies.

[1] Members of the genus Aristolochia are known for fly pollination and are similar to pitcher plants and flytraps.

Caterpillars can especially tolerate the acids contained within the plant and, in turn, cause them to become poisonous to predators.