I understand it is an anti-inflamatory seed, used in southamerica as such, but I don't remember the name given to it over there.

I have not heard of it...

What is it?

Mucuna pruriens is sometimes used as a coffee substitute called "Nescafe" (not to be confused with the commercial brand). Cooked fresh shoots or beans can also be eaten. This requires that they be soaked from at least 30 minutes to 48 hours in advance of cooking, or the water changed up to several times during cooking, since otherwise the plant can be toxic to humans. The above described process leaches out chemical compounds such as levodopa, making the product suitable for consumption. If consumed as food, unprocessed Mucuna pruriens is toxic to nonruminant animals including humans.

In history, M. pruriens has been used as an aphrodisiac[4] (hence the species name, pruriens, i.e., prurience/prurient). It is still used to increase libido in both men and women due to its dopamine inducing properties. Dopamine has a profound influence on sexual function.[5][6] A typical dose for a man is 15 g of ground seeds mixed with cow's milk.[1]

Mucuna pruriens seeds have also been found to have antidepressant properties when consumed.[7]

Dried leaves of Mucuna pruriens are sometimes smoked.[1]

Mucuna pruriens has also recently become popular among lucid dreaming enthusiasts: when combined with other supplements that stimulate the cholinergic system, the dopamine presumably produced from the consumption of Mucuna pruriens confers upon the lucid dreamer greater motivation and confidence.

Wikipedia

Is it legal in the US?