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.
Beragam varietas yang terancam termasuk tanaman persik Blood Cling, persik berdaging buah merah yang dibawa oleh Misionaris Spanyol ke Benua Amerika, kemudian dibudidayakan oleh penduduk asli Amerika selama ratusan tahun; tanaman aprikot yang dibawa oleh imigran Negara China yang datang bekerja di jalur kereta api transkontinental; dan banyak varietas tanaman prem yang berasal dari Timur Tengah dan kemudian dibawa oleh para imigran dari Italia, Prancis dan Jerman.