Loading variety overview…
World of CitrusWorld of CitrusKing Tangor
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc303 (opens in a new tab)
Accessed
Louis Trabut · Journal d’agriculture traditionnelle et de botanique appliquée · 1926-08
https://www.persee.fr/doc/jatba_0370-3681_1926_num_6_60_4435 (opens in a new tab)
Trabut’s 1926 comparison identifies King Siam / Roi de Siam as a late large mandarin of Cochinchina origin, with rough very thick rind, pleasant aroma, and February–March Algerian season. The catalog match is King Tangor; the source calls it King Siam, so this is a historical identity-bound comparison, not an alias assertion or genetic claim.
Accessed
Never Enough Dirt · YouTube · 2022-02-05
https://www.youtube.com/watch?v=1C4qCAzapi8 (opens in a new tab)
Summary from transcript: The presenter describes Cam Sanh/King Tangor budwood grafted onto several rootstocks, including a seedling from a Valencia tree, a Pink Lemonade lemon tree, and King itself. He describes bumpy rind, says orange-colored and greener fruits he tasted remained tart and needed more time, and later describes juice from a fruit he considered ready as on the sweet side. These are subjective reports with no accession, exact sampling date, measurements, or evidence that the trees match catalog CRC 303.
Accessed
University of California, Riverside — Givaudan Citrus Variety Collection
https://citrusvariety.ucr.edu/crc3845 (opens in a new tab)
Directly reviewed accession page for CRC 3845 (PI 539457, VI 235). UCR states it was received as seed from a CRC Plant Breeding seedling in 1931, lists Carrizo citrange and C-35 citrange rootstocks and Riverside February–April season, and says rind surface varies with rootstock/environment while acceptable fruit quality requires very hot climate. The page reproduces a historical 1967 description; that text is not a controlled trial of this accession. Keep distinct from catalog source #1, CRC 303; the CRC 303 page's comparison is tentative, not proof of identity.
Accessed
VIRIAR · May 4, 2026
https://www.viriar.com/blogs/citrus-encyclopedia/citrus-nobilis-king (opens in a new tab)
Commercial secondary encyclopedia profile; no accession, location, sample, rootstock, or measurement method is identified. It gives generic morphology figures (including 8–12 cm fruit, thick rough rind and 10–20+ seeds) and a −2°C / USDA 9b–11 cold claim without exposure or trial evidence. Its seasonal claims conflict internally (April/May, April–May, and California April–June / Florida March–May); its 1882 William Saunders origin claim conflicts with UCR's sourced account of 1880 arrival at Riverside from South Vietnam. Preserve those as attributed secondary claims only, not accession-specific measurements or a measured hardiness result.
Accessed