Amaranth
The name amaranth hails from the Greek for "never-fading flower." The plant is an annual herb, not a "true" grain and is a relative of pigweed.
Amaranth was a staple in the diets of pre-Columbian Aztecs, who believed it had supernatural powers and incorporated it into their religious ceremonies. The grain was forbidden by the Spanish, and consequently fell into obscurity for hundreds of years. If not for the fact that the cultivation of amaranth continued in a few remote areas of the Andes and Mexico, it may have become extinct and completely lost to us. Since 1975 amaranth has been gaining support in the U.S.