(a) Early Feutrall. Fruit oblate; rind orange-red, smooth and glossy. Pulp sweet and juicy. Introduced from Australia. Ripens in November.
(b) Kinnow. Fruit deep yellow, apex round and flatened. Rind orange, smooth and glossy. Pulp very juicy, sweet-acidic and rich in flavour. Ripens in December-February. Introduced from N. America.
Trees to 3 m tall. Branchlets numerous, with short spines. Petiole 8-10 mm, very narrowly winged; leaf blade elliptic, 6-7 × 3.5-4 cm, secondary veins inconspicuous, base broadly cuneate, margin crenulate, apex narrow, obtuse, and conspicuously emarginate. Flowers solitary, 1.2-1.4 cm in diam.; flower buds subglobose. Pedicel ca. 2 mm. Petals white. Stamens ca. 20. Fruit yellow, oblate, 2-2.5 × 2.5-3.4 cm, smooth; pericarp 1.5-2 mm thick; sarcocarp with 7-9 segments, yellow, very acidic and bitter, 5- or 6-seeded. Seeds broadly ovoid, ca. 1 cm; seed coat smooth; embryos numerous; cotyledons greenish.
Hillside forests; low elevations. Taiwan [Japan (Ryukyu Islands)].