Chironja grapefruit hybrid (CRC 3909)
Citrus paradisi Macfadyen
Photos by Toni Siebert and David Karp, CVC, 5/22/2008. Photo rights. 25 year old trees.
Source: Received as budwood from Puerto Rico via Glenn Dale at the request of W.P. Bitters, 1983.
Parentage/origins: Parent unknown.
Rootstocks of accession: Carrizo citrange, C-35 citrange
Season of ripeness at Riverside: January to May
Notes and observations:
3/10/1988, EMN: Dr. Bitters suggests that this might be a pummelo-orange hybrid instead of a grapefruit-orange hybrid; but he is not sure, so we will keep it in the grapefruit hybrid group for now.
3/11/1988, EMN: The reason Dr. Bitters thinks this may not be a grapefruit- sweet orange hybrid is because it is monoembryonic and both grapefruit and sweet orange are highly polyembryonic; therefore: Chironja should be more likely a pummelo-orange hybrid, maybe, perhaps, etc. etc.
2/26/1990, EMN: Only a very few fruits-small & still mostly green- off-bloom?--EMN
6/10/2009, DK & TS: Oblong; fine, tender orange flesh; medium seedy; sweet and juicy, with flavor more like orange than grapefruit.
Description from The Citrus Industry Vol. 1 (1967):
Fruit large (grapefruit size), broadly obovoid to pyriform: low neck or broad somewhat furrowed collar; few-seeded, seeds strongly polyembryonic. Rind medium-thin, smooth, moderately adherent but readily peelable; color bright yellow at maturity. Segments about 10; axis medium-large and semi-open. Flesh color yellowish-orange; tender, very juicy; flavor mild, lacking the bitterness of the grapefruit. Midseason in maturity and fruit holds well on tree.
Availability: Commercially available in California through the Citrus Clonal Protection Program.
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