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World of CitrusWorld of CitrusMarsh Grapefruit
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc3184 (opens in a new tab)
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Fruit Maven · Fruit Maven · 2009-12-04
https://fruitmaven.com/2009/12/marsh-grapefruit/ (opens in a new tab)
The live Fruit Maven article describes one Marsh grapefruit purchased at a California farmers’ market and grown by Creekside Tropicals. It reports yellow peel and flesh, sweet/floral aroma, very juicy texture, thick pith, and a few small seeds; the market, sample date, tree, and rootstock are unstated. The author says the fruit was neither overly tart nor very sweet; this comparative wording is not a taste-intensity score. Winter is listed as peak season.
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Veronica Tegen · Ask The Food Geek · 2020-02-27
https://askthefoodgeek.com/grapefruit/ (opens in a new tab)
The page was modified January 4, 2026. Its table maps Marsh, White Marsh, and Marsh Seedless to white/pale-yellow flesh, and Pink Marsh/Pink/Thompson to pink. The white-grapefruit section says Marsh is not Pink Marsh; the Pink Marsh section identifies Thompson. This is general cultivar guidance, not an accession-specific specimen description; taste wording is not used as a numeric intensity score.
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Naturally Nat and Fam · 2024-02-21
https://www.youtube.com/watch?v=F7LauW-XImM (opens in a new tab)
Summary from transcript: English transcript segments cover 0:00–1:57 of the 2:04 video; caption authorship is unspecified. The speaker questions the identity/quality of their 'Marsh white' fruit and reports a nursery professional’s secondhand view that their Marsh whites are less acidic and less intensely grapefruit-flavored than Duncan. The tree/accession is not verified, and this account does not identify Frost Marsh, Thompson, or Whitney Marsh. No numeric intensity score or flesh-color evidence is provided.
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fruitmentor fruits · 2026-06-09
https://www.youtube.com/watch?v=-yI3caFUqC4 (opens in a new tab)
Summary from transcript: English captions designated 'authored or unspecified' cover 0:00–7:35 of 7:48. The speaker identifies one Marsh grapefruit grown in California’s Central Valley; tasters compare it with an uncertainly sourced store-bought grapefruit. The Marsh fruit measured 9.0 °Brix in the video and was described as less sweet than the store sample; Brix is not converted to a sweetness category. The speaker attributes the result to an unusually hot year, an uncontrolled opinion rather than a tested climate effect. Do not transfer the store fruit’s taste remarks to Marsh or infer Marsh flesh color/selection identity.
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J.V. da Graça, E.S. Louzada, and J.W. Sauls · Proceedings of the International Society of Citriculture · 2004
The paper identifies Marsh as a white-fruited Florida seedling of Duncan. The prose dates it to around 1860 (p. 369), while Fig. 1 dates the Florida seedling to 1850 (p. 370); retain this internal date conflict. It also mentions an unnamed 1919 California Marsh bud sport (p. 370); this note does not identify that limb as Marsh itself.
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W.S. Castle; K.D. Bowman; J.C. Baldwin; J.W. Grosser; F.G. Gmitter Jr. · HortScience 46(6):841–848 · 2011-06-01
https://doi.org/10.21273/HORTSCI.46.6.841 (opens in a new tab)
Peer-reviewed field study of Marsh grapefruit scions on multiple rootstocks in Florida, including Sacaton citrumelo. This citation is for grafted Marsh-tree outcomes, not Marsh as a rootstock or a standalone cultivar fruit description.
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Eduardo Sanches Stuchi; Luiz Carlos Donadio; Otávio Ricardo Sempionato; José Antonio Alberto da Silva · Fruits 57(5–6):267–272 (2002); CIRAD/EDP Sciences · 2002
https://doi.org/10.1051/fruits:2002023 (opens in a new tab)
A replicated Brazilian field trial evaluated Marsh seedless grapefruit scions on ten rootstocks, including Thornton tangelo, at Bebedouro, São Paulo. The study was planted in January 1991; yield was measured in 1994–2000, fruit quality in 1994–1999, and tree size in May 2000. Thornton-specific outcomes belong to the Marsh scion/rootstock combination, not fruit borne by Thornton. Direct CIRAD PDF retrieval was unavailable in this pass; article metadata and indexed full text were read from the publisher’s article and abstract records.
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Graham H. Barry et al. · The Genus Citrus · 2020
ScienceDirect Topics excerpt from section 5.2 of The Genus Citrus (2020). The secondary chapter says Marsh usually has two or three seeds per fruit, compared with Duncan’s 30–60; this is a general cultivar account, not a measured sample.
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Ana Paula de Moraes; Walter dos Santos Soares Filho; Marcelo Guerra · Springer · 2007
https://pubmed.ncbi.nlm.nih.gov/17295131/ (opens in a new tab)
Chromosome Research 15(1), 115–121 (2007); DOI 10.1007/s10577-006-1101-2. The PubMed abstract reports sequential CMA/DAPI staining and rDNA-FISH for six grapefruit, two pummelos and one tangelo. It places Marsh Grapefruit in the group reported to have three CMA-positive C-type and five D-type chromosomes, with five reported 45S rDNA sites. Two chromosomes carried 5S rDNA across the accessions. Full text was not available in the inspected publisher view. These marker patterns are not a ploidy determination, full chromosome count, shared cultivar identity or proof of this cultivar's parentage.
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Guohong Albert Wu et al. · Nature · 2018-02-07
https://doi.org/10.1038/nature25447 (opens in a new tab)
Study-name finding: Figure 1 labels a Marsh grapefruit study accession (PAR), and Figure 3 identifies sweet orange as its male parent; the abstract reports grapefruit as a pummelo–sweet-orange hybrid. These findings support a taxon-level candidate of Pummelo seed × Sweet Orange pollen, not a named parent clone. Supplementary accession details were unavailable, so exact accession-to-catalog-clone identity is unverified.
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W. S. Castle; C. O. Youtsey; D. J. Hutchison · Proceedings of the Florida State Horticultural Society · 1986
https://journals.flvc.org/fshs/article/view/94731 (opens in a new tab)
Full article, Proc. Fla. State Hort. Soc. 99:33–35 (1986), reviewed. The paper's Davenport, Florida field trial was planted in 1968 at 10 × 15 ft (about 290 trees/acre) in Astatula fine sand. It reports Marsh grapefruit scions on Rangpur × Troyer and rough lemon rootstocks yielded equally during the first 11 years, while the smaller Rangpur × Troyer trees produced more soluble solids per tree. In later years trees were hedged and topped to 12 ft; after freezes, rough-lemon trees were badly damaged and bore no fruit for two years, while Rangpur × Troyer trees survived and continued to produce. The source reports no specific freeze temperature or dates. These are trial results for grafted Marsh scions, not rootstock fruit traits.
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Prita Sari Dewi; Akira Wakana; Yuu Tanimoto; Yumiko Fujiwara; Kaori Sakai; Kohei Kajiwara · Journal of the Japanese Society for Horticultural Science 82(3):203–214 · 2013
https://www.jstage.jst.go.jp/article/jjshs1/82/3/82_203/_html/-char/en (opens in a new tab)
Primary cultivar-specific experimental evidence. Table 1 classifies embryo number and male fertility; embryo means were measured under a stereoscopic microscope in twenty seeds per cultivar, except Foster Pink and Marsh whose embryo count was not examined. Table 2 reports selected zygotic progeny from controlled crosses; it is not a percentage of all seeds that are zygotic. Material grown at Sasaguri Orchard, Kyushu University Farm, Fukuoka, Japan. Preserve the difference between parent fertility and male fertility segregating among offspring. DOI:10.2503/jjshs1.82.203. Source captured in docs/research/breeding-keywords-2026-10-10/dewi-2013.html.
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