Fortunella japonica

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Fortunella japonica

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Ordre Sapindales
Famille Rutaceae
Genre Fortunella

2n = 18, 20, 36

Origine : Chine


Français kumquat rond
Anglais round kumquat

Résumé des usages
  • fruit consommable avec la peau


  • arbre atteignant 5m de haut, à épines variables (5 cm sur jeunes rameaux)
  • feuilles unifoliolées, de 4-6 cm de long, à aile du pétiole étroite, dentée à l'apex
  • fleurs solitaires ou en fascicules
  • fruit orange vif à rouge, globuleux à un peu aplati, de 9-10 cm de diamètre
The first fairly complete description of this species, under the name Citrus japonica, was published in 1784 by Thunberg in his Flora japonica; it reads in translation, as follows: "petiole winged, leaves acute, shrubby stem. Japanese: Kin Kan, vulgo Fime tats banna, Kaempf., Am. ex., Fase. V. p. 801. Growing here and there, often cultivated for its little fruits. Stem shrubby, compressed-subangulate, erect, glabrous, scarcely a foot high. Branches and branchlets alternate, compressed-angular, spinose, glabrous, erect, green. Spines solitary, in the axils of the leaves, erect divergent. Leaves few, with winged petioles, ovate, somewhat acute, entire, somewhat concave, glabrous, dark green above, paler below, erect, spreading, 1 in. [2.5 cm] long, with very minute glands ('poris'). Petioles winged. 1 line [2 mm] long.
Flowers axillary, often solitary, rarely paired, pediculate, nodding. Pedicels glabrous, hanging down, 1 line [2 mm] long. Perianth, 1-phyllous, green, glabrous, minute, 5-toothed. Petals 5, white, oblong, somewhat concave, spreading, somewhat claw-like. Filaments 19, subulate, compressed, erect, in 5 more or less coherent bundles, connate, forming a cylinder, shorter than the corolla, nearly equal in length, white. Anthers oblong, small, yellow. Ovary superior, subglobose, glabrous. Style solitary, cylindrical, slightly shorter than the stamens, greenish white. Stigma simple, globose, yellow, striate, many-locular within.
Fruit with fleshy peel, vesicular pulp, 9-locular [sic], the size of a cherry. Differs from the other species of Citrus especially in being a very small shrub with minute fruits; thus it can scarcely be considered as a variety of orange. It resembles Citrus medica in the axillary flowers, but differs in the winged petioles; it differs from the orange in the axillary flowers, which are solitary or paired, never in panicles. Fruit ripens in December and January, is very sweet, agreeable and edible."
This description was evidently drawn from a very small plant, perhaps an artificially dwarfed one, such as are commonly grown in Japan. The very small leaves with axillary spines, and the fruits "the size of a cherry" strongly indicate that Thunberg was describing the round kumquat and not the oval kumquat (F. margarita). His plate of this plant published in 1800 shows a flowering twig with small leaves and well-developed axillary spines.
Hume (1903 and 1926) described this species as follows:
"Tree similar to Nagami [F. margarita], except that it is slightly thorny, and has the leaves somewhat smaller and rounder at the apex. Leaves oval; apex obtuse; margin crenate halfway down the length; veins slightly more conspicuous than in Nagami; borne on short rigid, inconspicuously winged petioles, 1/4 to 1/2 in. [6-13 mm] in length. Fruit spherical or somewhat oblate, 1 to 1 1/4 inches [2.5-3 cm] in diameter; golden yellow, short stalked; calyx small; rind smooth, thin, spicy to the taste and aromatic when bruised; oil cells large; pulp sparse; juice acid; sections four to seven; seeds one to three, small, oval, greenish; cotyledons two, greenish. Season same as Nagami." The Citrus Industry Vol. 1.

Noms populaires

français kumquat rond, kumquat marumi
anglais round kumquat, marumi kumquat
allemand Kumquat, Marumi-Kumquat
néerlandais kumquat
italien fortunella, kunquat
espagnol kumquat redondo
portugais cunquate
chinois 金柑 - jīn gān (Flora of China) ; jīn jú ; kin, kin kuit
japonais maru kinkan, marumi kinkan


Fortunella japonica (Thunb.) Swingle (1915)

basionyme :

  • Citrus japonica Thunb. (1780)

synonyme :