What is the native wheat plant found in the U.S.?

The native wheat plant found in the U.S. is not maize but rather the correct native variety is red wheat, which is closely associated with the development of agriculture within the U.S. This wheat is adapted to the climate and soil conditions found in various regions across the country. Red wheat varieties are particularly significant due to their hardiness and suitability for growing in the diverse agricultural landscapes of the U.S.

In contrast, the other choices do not represent a native wheat plant. Spelt and durum are both types of wheat that have been cultivated for hundreds of years but are not indigenous to the U.S., originating from other regions. Maize, while a vital crop in the U.S., is actually corn and not a wheat plant, thus making it irrelevant to this question about native wheat species. Therefore, red wheat stands out as the primary representative of wheat that is native to and cultivated within the U.S. agricultural system.