Grapefruit originated in the Antilles from a cross between the orange (C. sinensis) and the pomelo (C. grandis). It reaches a height of 20 feet, with a trunk 6 or more inches in diameter. The leaves are up to 6 inches long, generally with finely serrated borders and the sides of the petiole covered by a small blade. Flowers are up to 2 inches wide, have four petals, and are solitary or form small groups. Fruits are up to 6 inches wide and turn yellow when ripe; the pulp is pale yellow, rose, or red depending on the variety. It flowers during spring and fruits mature mostly during fall and winter, some fruits persist until spring. The generic name derives from the common name for citron (Citrus medica). The species name refers to the paradise.

The photographed tree is west of the chancellor’s house and is the only member of the species in the campus. It is a remnant of a citrus collection that existed in the area.

Flowers: this link.

Citrus paradisi (Rutaceae)