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.
Entre as variedades ameaçadas, estão a Blood Cling, um pêssego de polpa vermelha trazido às Américas por missionários espanhóis e cultivado pelos povos nativos americanos por séculos; um damasco trazido por imigrantes chineses que vieram trabalhar na ferrovia transcontinental americana; e inúmeras variedades de ameixas oriundas do Oriente Médio e trazidas por imigrantes italianos, franceses e alemães.