Marumi (CRC 3237)

Fortunella japonica

CRC 3237

PI 539727

Photos by David Karp and Toni Siebert, CVC. Photo rights.  

Source: Received as seed from John Carpenter, USDCS, Indio, CA, 1957.

Parentage/origins: Parents unknown.

Rootstocks of accession: Cleopatra mandarin

Season of ripeness at Riverside: Year round

Season of flowering at Riverside: May to August

Notes and observations:

John Carpenter received seeds from USDA, Orlando, Florida.

EMN, 1/20/1989: First light crop on trees planted in spring 1988. Looks OK on Cleo & Nagami/Carrizo sandwich so far. Fruit is much like Meiwa but about half the size, and a lighter crop. 

Description from The Citrus Industry Vol. 1 (1967):

" 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.   Parianth, 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."

Availability: Not commercially available through the Citrus Clonal Protection Program.

USDA Germplasm Resources Information Network page for Marumi kumquat (CRC 3237)