X Citrofortunella microcarpa (Bunge) Wijnands
Citrus madurensis Lour.
Photos by David Karp and Toni Siebert, CVC. Photo rights.
Source: Received as a seedling from USDA, Washington, D.C., via Walter Swingle, 1935.
Parentage/origins: Parents unknown. It is believed to be a natural hybrid, with kumquat in the parentage.
Rootstocks of accession: Own root.
Season of ripeness at Riverside: Year-round
Notes and observations:
Calamondin Citrus madurensis is an acid fruit that is most commonly grown in the Philippine Islands although it is probably of Chinese origin. It is believed to be a natural hybrid, with kumquat in the parentage. In the Philippines it is sometimes called calamonding or calamansi. Here in the United States it is primarily planted as an ornamental, either growing in the ground or in a container. Calamondin is cold-resistant. The tree form is upright and columnar, and the leaves are small and dense giving the tree a fine textural appearance. The fruits are very small, round, and orange at full maturity. The orange flesh is acidic, juicy, and contains a few seeds. Calamondin trees flower and set fruit intermittently throughout the year, adding to the decorative appeal of these trees. A variegated form, with marbled leaves and faintly-striped fruit is sometimes marketed under the name Peters.
WPB: Dr. Hu, in 1951, said that Chi Chieh is sechi chieh- which means four season.
Description from The Citrus Industry Vol. 1 (1967):
"Fruit very small, oblate to spherical; apex flattened or depressed. Rind color orange to orange-red; very thin, smooth, and finely pitted, easily separable only at maturity; sweet and edible. Segments about 9 and axis small and semi-hollow. Flesh orange-colored; tender, juicy, and acid. Seeds few, small, plump, polyembryonic, and with green cotyledons. Fruit holds on tree remarkably well.
Availability: Commercially available in California through the Citrus Clonal Protection Program.
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