Citrus vulgaris sour orange hybrid

Japanese orange

CRC 760
PI 539177


Received as seed from P.J. Webster, Lamao, Bataan, Philippine Islands, 1916.


Parents unknown. Thought to be a hybrid with citron.

Rootstocks of accession

Carrizo citrange, C-35 citrange

Season of ripeness at Riverside

January to March.

Notes and observations

1928, Tanaka: This is not known as "Japanese Orange."

RGL: Japanese orange must be a name given to this fruit in the Philippines.

1986, EMN: This appears to be a sour orange. This accession had seedling yellows, removed by thermotherapy. Citrus vulgaris does not appear in TCI, Vol. I.

2/26/1988, EMN: No fruit on trees but one fruit on ground (presumably from this cultivar) indicates possible citron hybrid. Young flush is dark purple.

1/20/1989, EMN: Probably not a sour orange. Externally, fruit resembles a Palestine sweet lime, but is not sweet. Greenish yellow flesh is VERY sour. Moderately thick rind, moderately seedy. Young fruits are purple. Is this a lemon or citron hybrid?

2/11/2008, OJB, TS & DK: Fruit round, yellow; flesh light green and slightly firm; both tree and aroma like citron; tree has dieback. 


Not commercially available in California.

USDA Germplasm Resources Information Network page for Japanese orange sour orange hybrid


Photos by David Karp and Toni Siebert, CVC.
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