The Sampson tangelo resulted from a cross in which pollen of the Dancy tangerine was used to pollinate an ordinary grapefruit. The grapefruit so cross-pollinated contained a large number of seeds, 76 in all, which gave a total of 106 seedlings (several seeds sending out more than one sprout), and these seedlings were serially numbered from 1310 to 1415. With the exception of the Sampson tangelo (C. P. B. 1316), most of the seedlings appeared to be false hybrids or ordinary grapefruit ; however, a number of them were, distributed to cooperators to be tested for possible hybrid character. Fruit medium-sized, globose to slightly obovate; often somewhat necked; color orange-yellow; seedy. Rind smooth, thin, relatively adherent; axis semi-hollow. Flesh color dull orange; juicy, somewhat acid; flavor with distinctive bitterish tang. Late-midseason in maturity. Seeds highly polyembryonic. Tree vigorous, spreading, large, and productive; leaves distinctive, cupped, and boat-like It was named and described by Webber and Swingle of the U.S. Department of Agriculture in 1904. It has never attained commercial importance, except as a rootstock to a limited extent, but is still grown somewhat as an ornamental and an oddity.