Most modern grapefruit varieties, including the pink and red pigmented varieties, can be traced back to this source. This variety represents the oldest grapefruit clone grown in Florida, though it was not named and introduced until about 1892. As near as can be determined, the parent seedling tree was planted around 1830 near Safety Harbor, on the Pinellas Peninsula, Florida. The seed came from a tree in the original planting made by Count Odette Phillippe, who is credited with having brought the grapefruit to Florida from the West Indies. It was named for the introducer, A. L. Duncan of nearby Dunedin. Referenced in older USDA records as Bowman grapefruit. One of the oldest and most historically important grapefruit cultivars, valued less today for fresh consumption and more for its genetic, historical, and breeding significance. It is considered the classic “true” grapefruit against which many later selections were compared. The tree is large, spreading, and grows vigorously. The fruit is almost round and has a smooth, light yellow rind. The flesh is very pale yellow, juicy, and seedy. The flavor is considered by many to be superior to similar seedless grapefruit varieties. Duncan is considered to be somewhat early in maturity. The fruit holds well on the tree. Tree vigorous, large, very productive, and reputed to be probably the most cold-resistant.