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World of CitrusWorld of CitrusThornton Tangelo
Givaudan Citrus Variety Collection at UCR
https://citrusvariety.ucr.edu/crc2013 (opens in a new tab)
Accessed
T. Ralph Robinson · Proceedings of the Florida State Horticultural Society · 1934
https://journals.flvc.org/fshs/article/download/102840/98771/0 (opens in a new tab)
T. Ralph Robinson, Proceedings of the Florida State Horticultural Society 47 (1934), pp. 110–112. The publisher-hosted PDF text was returned as an indexed full-text extraction; direct PDF open returned 403. Printed pp. 110–111 include Thornton in a historical December–March shipping-season statement and say the older Thornton and Sampson tangelos did not ship well. The thin-skin and scab passages refer to Sampson specifically and are not assigned to Thornton.
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Aydin Uzun; Turgut Yeşiloğlu · IntechOpen · 2012-03-14
https://www.intechopen.com/chapters/31479 (opens in a new tab)
Chapter 11 in Genetic Diversity in Plants, edited by Mahmut Çalışkan (2012), pp. 213–230. Section 4 (printed p. 219) summarizes SRAP-marker results, placing tangelos and tangors closer to mandarins than to oranges and pummelos, and lists Thornton among cultivars “grouped closely.” This is a broad secondary marker-cluster account, not a Thornton-specific score, accession assignment, or parentage finding. The supplied ResearchGate figure link is not a separate source; its figure depicts Minneola and Orlando.
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Eduardo Sanches Stuchi; Luiz Carlos Donadio; Otávio Ricardo Sempionato; José Antonio Alberto da Silva · Fruits · 2002
https://doi.org/10.1051/fruits:2002023 (opens in a new tab)
Stuchi et al., Fruits 57(5–6) (2002), 267–272. The supplied CIRAD PDF resolves to this study (DOI 10.1051/fruits:2002023); direct PDF retrieval failed, and the article text was available through indexed full-text results. In a São Paulo trial, Thornton was one rootstock used under Marsh seedless grapefruit; the scion’s fruit-quality and yield results are not Thornton fruit data. Keep any reported measurements and conclusions restricted to this Marsh-on-Thornton combination and the study’s site, design, and dates.
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Walter T. Swingle; T. Ralph Robinson; E. M. Savage · United States Department of Agriculture, Circular No. 181 · 1931-08
USDA Circular No. 181, Washington, D.C., August 1931. In the Thornton tangelo entry (printed p. 4), the authors say the original hybrid records were lost and its pollen parent was not definitely known; they identify grapefruit as the known seed parent and infer tangelo character from tangerine-like sister hybrids. They report that fruit identified as C.P.B. 1282 at several Florida stations placed Thornton in Swingle’s 1899 hybrid series. This is the historical account’s attribution, not a recorded specific cross or an independently verified parentage.
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Robert Willard Hodgson · University of California, Division of Agricultural Sciences · 1967
Chapter 4, Thornton profile. Hodgson reports that Thornton originated as a grapefruit and tangerine (probably Dancy) hybrid made by Swingle in Florida in 1899 and was named and released in 1904. This retrospective account supports the 1904 naming and release dates; it does not establish a named pollen parent.
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Walter T. Swingle; T. Ralph Robinson · U.S. Department of Agriculture, Bureau of Plant Industry, Crop Physiology and Breeding Investigations · 1918-04-18
https://archive.org/details/CAT31443278 (opens in a new tab)
C.P. & B.I. Circular no. 4. Printed title page and final page identify authors Swingle and Robinson; Wm. A. Taylor is listed as approving official, not author. Printed pp. 1–2 (PDF pp. 3–4): Thornton maturity and fruit observations; early November–December ripening is reported for some trees and the authors say further testing was needed to determine whether it was inherited or local. Do not interpret the circular’s aggregate p. 3 canker discussion as a Thornton result.
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