X Citroncirus spp. RUTACEAE
Received as budded trees from John Carpenter, USDCS, Indio, CA, 1975.
Citrus paradisi 'Duncan' X Poncirus trifoliata
Rootstocks of accession
Carrizo citrange, C-35 citrange
Season of ripeness at Riverside
October to November
Notes and observations
Received at CRC as budded trees. See CRC 3341. Note by R.K. Soost, 7/85: This source may be from original bud source of CPB 4475. John Carpenter received budwood from USDA Foundation Farm, Leesburg, Florida (Block 9, R-22, T-5) in February 1974. He planned to distribute trees to UCR and/or Lindcove. (CPB 4475 was released by USDA as 'Swingle' citrumelo in (1974?).)
This maybe from original bud source of CPB 4475. John Carpenter received budwood from USDA Foundation Farm, Leesburg, Florida (Block 9, Row 22, Tree 5 [sic]) in February 1974. He planned to distribute trees to UCR and/or Lindcove. CPB 4475 was released as 'Swingle' citrumelo in (1974?). (RK Soost, 07/1985)
There are currently three (apparently redundant) accessions of 'Swingle' maintained at the Repository: the current accession PI 539844/RCRC 3767, PI 539828/RCRC 3771, and PI 539824/RCRC 3341. Apparently PI 539844/RCRC 3767 and PI 539828/RCRC 3771 were received from the same source (USDCS) at slightly different times and were given different CRC numbers (which were assigned differently in the 1970s than they are now). It appears that PI 539844/RCRC 3767 was received about a year later than PI 539828/RCRC 3771 and was planted into the Citrus Variety Collection without any sort of indexing, or possibly it was indexed without receiving a VI number. In any case, it appears that PI 539844/RCRC 3767 and PI 539828/RCRC 3771 are the same genotype and derived from the same source and as such are definitely redundant.
For more information on 'Swingle' citrumelo in general, please refer to the record for PI 539828/RCRC 3771, the budline maintained at the Repository. (RRK, 01/2008)
Anonymous. 1974. Notice To Fruit Growers And Nurserymen Relative To The Naming And Release Of The Swingle Citrus Rootstock. unspecified Release Notice, USDA-ARS.
Not commercially available in California.
USDA Germplasm Resources Information Network page for Swingle citrumelo CRC 3767