America's First Navel Orange Tree

At an intersection ringed with apartment houses and a strip mall in Riverside stands the Eliza Tibbets tree, which made history 140 years ago. It's one of two mutant specimens imported from Brazil to produce the first navel oranges in the US. Now it's in trouble. Tracy Kahn is principal museum scientist at the Department of Botany and Plant Sciences at UC Riverside and curator of its Citrus Variety Collection, with more than 1000 kinds of fruit.