Those varieties that are threatened include the Blood Cling, a red-flesh peach brought by Spanish missionaries to the Americas, then cultivated by Native Americans for centuries; an apricot that was brought by Chinese immigrants who came to work on the Transcontinental Railroad; and countless varieties of plums that originated in the Middle East and were then brought by Italian, French and German immigrants.
Las variedades amenazadas  incluyen el "Blood Cling", un durazno de pulpa roja que trajeron a América los misioneros españoles, luego cultivado por los indígenas americanos durante siglos; un albaricoque que trajeron  los inmigrantes chinos que vinieron a trabajar en  el ferrocarril transcontinental; e incontables variedades de ciruelas  originarias del Medio Oriente que luego trajeron los inmigrantes  italianos, franceses y alemanes.