As to citrus seeds: Almost all sweet Oranges, true Grapefruit, Lemons, limes, pure Mandarins (other than King & Clementine), most Tangelos, hybrid Tangerines and Tangors (except Temple) produce true from seed. Most all Pummelos DO NOT produce true from seed. As to the spelling, pummelo is considered the correct spelling of the fruit. No way of knowing when that particular fruit was picked, but probably the seeds came from being cross pollinated by another fruit. Pummelo, grow well in Florida.