Citrus (Citrus paradisi x Ponciris trifoliata) 'Swingle'
'Swingle' Citrumelo is a thorny, semi-evergreen Grapefruit x Ponciris hybrid with fragrant white flowers and somewhat pear-shaped yellow fruits the size of a large orange. Fruit is more ornamental than edible but this is a quite hardy plant which is often used as an understock for commercial Citrus varieties. Named for W.T. Swingle, pioneer Florida Citrus breeder who in the late 19th and early 20th centuries created many of the hybrid citrus still grown today.
USDA Hardiness Zone 7-10