It turned out not to be indigenous African glaberrima, but more likely a Japonica rice that made its way from Southeast Asia to West Africa between the 16th and 18th centuries.
Amy Lawton-Rauh, a Clemson University professor of genetics and biochemistry who is working on the genetics of hill rice, is using population genomics tools to test whether the hill rice has a more complex history. It could even be a hybrid, she said, and not necessarily linked to Jefferson’s rice.
So much rice may have been passed around among slave families and descendants that there is no way to be certain where the seed originated, said Christopher Wilson, director of experience design at the Smithsonian’s National Museum of American History.
“It might be too much to just give credit to Jefferson,” Mr. Wilson said. “We know about him because we have records. But people miss just how big rice was, and how much money was involved and how much history we have no written record of.”
Still, he is as excited as anyone about the hill rice. He has introduced Mr. Roberts to a horticulturist at the Smithsonian to grow and display some of the hill rice. Last summer, Mr. Wilson invited Mr. Roberts to discuss the rice alongside Michael Twitty, a culinary historian and the author of ”The Cooking Gene: A Journey Through African American Culinary History in the Old South” at a Smithsonian event.