Podcast:The Atlas Obscura Podcast Published On: Fri Aug 08 2025 Description: There are thousands of varieties of citrus, many more than just the navel oranges. And they’re all being preserved in a collection at the University of California Riverside. Learn more here. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.