There are two different things that are referred to as "duck flower" in the search results.

1. Aristolochia grandiflora: This is a deciduous vine with one of the worlds largest flowers that emits an odor that smells like rotting meat, attracting flies. It is also known as the pelican flower and is native to the Caribbean and Central America.

2. Duck Flower Detox: This is a natural supplement made from the blossom of a tropical plant called Aristolochia Grandiflora (Flor De Pato), and it is also called Pelican Flower. It is an organic wild-crafted alkaline herb that contains a good deal of health benefits. It is used for menstrual pain relief, to restore mental clarity, regulate heartbeat, enhance metabolism, and help with weight loss. It is also believed to boost energy, reduce bloating, treat hangovers, improve sleep quality, and remove parasites and bacteria from the body.

In summary, "duck flower" can refer to a type of flower called Aristolochia grandiflora or a natural supplement called Duck Flower Detox made from the blossom of a tropical plant called Aristolochia Grandiflora.